名词性从句教案

专题3 名词性从句
【专题要点】名词性从句考点概览：和what引导名词性从句的区别； 2.名词从句的语序和时态；
作形式宾语的几种情况； 从句作介词宾语； 5.宾语从句的否定转移； r和if
的用法区别； 在名词性从句中的使用； 后的名词性从句的使用。
【考纲要求】考 纲明确要求考生在复习备考中应该掌握名词性从句的基本用法；一些易混引导词的辨析；
句子的语序、否 定前移；名词性从句和定语从句、状语从句的辨析等。
【知识网络】 名词性从句的用法
在句子中起名词作用的句子叫名词从句 (Noun Clauses）。 名词从句的功能相当于名词词组, 它在复合
句中能担任主语、宾语、表语、同位语、介词宾语等，因此 根据它在句中不同的语法功能，名词从句又可
分别称为主语从句、宾语从句、表语从句和同位语从句。
一、引导名词性从句的连接词
引导名词性从句的连接词可分为三类：
1. 从属连词：that（无任何词意）whether, if（均表示“是否”表明从句内容的不确定性）as if ,as though（均
表示“好像”，“似乎”） 以上在从句中均不充当任何成分
2. 连接代词：what, whatever, who, whoever, whom, whose, which. whichever, whomever
3. 连接副词：when, where, how, why
不可省略的连词：
1. 介词后的连词
2. 引导主语从句和同位语从句的连词不可省略。
二. 具体分类
1、主语从句 作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，i f和连接代词
what，who，which，whatever，whoever以及连接副词how ，when，where，why等词引导。例如：
What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。
Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。
有时为避免句子头重脚轻，常用形式主语it代替主语从句作 形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。常用句型如下：
（1） It + be + 名词 + that从句 （2）It + be + 形容词 + that从句
（3）It + be + 动词的过去分词 + that从句 （4）It + 不及物动词 + that 从句
1. 真可惜我们不能去游泳. It is a pity that we can’t go swimming.
2. 碰巧那天我外出了. It happened that I was out that day.
3. 他考试肯定会考好. It is certain that he will do well in the exam.
4. 据说他已告诉了她一切. It is said that he told her everything.
另注意在主语从句中用来表示惊奇、不相信、惋惜、 理应如此等语气时，谓语动词要用虚拟语气“(should)
+do”，常用的句型
It is necessary (important, natural, strange, etc.) that …
It is a pity (a shame, no wonder, etc.) that…
It is suggested (requested, proposed, desired, etc.) that…
训练1：用 it 句型翻译:
据说今年高一学生要学新教材. It is said that the Senior Grade one students will learn a new text
事实是他们靠自己完成了所有的任务. It is a fact that they finished all the work by themselves.
碰巧他们已经参加过军训了. It happened that they had had their military training.
众所周知, 比尔 · 盖茨是世界上最富有的人.It is well-known that Bill Gates is the richest person in the world.
我们应该养成好的学习习惯这很重要. It is important that we (should) form a good habit of studying.

2、宾语从句
名词句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语 从句的关联词大致一样，
在句中可以作谓语动词或介词及非谓语动词的宾语。
1. 由连接词that引导的宾语从句
由连接词that引导宾语从句时，that在句中不担任任何成分 ，在口语或非正式的文体中常被省去，宾语从
句中的连接词that在以下三种情况下不能省略：（1） 当that 从句与另一名词性从句并列作宾语时，第二
个that不能省；（2）当that作介词宾 语时，that不可省掉。（3）用it做形式宾语的宾语从句例如：
He has told me that he will go to Shanghai tomorrow. 他已经告诉我他明天要去上海。
We must never think (that) we are good in everything while others are good in nothing. 我们决不能认为自己什
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么都好，别人什么都不好。
注意1：在demand、order、suggest、decide、insist, desire, request, command等表示要求、命令、建议、
决定等意义的动词后，宾语从句常用“（should）+ 动词原形”。例如：
I insist that she (should) do her work alone. 我坚持要她自己工作。
The commander ordered that troops (should) set off at once. 司令员命令部队马上出发。
注意2：that 从句只跟在 except, but, in ,besides, save五个介词后面 介词后面不用if 和which
训练：改错
1. The Swede stood still, except that his lips moved slightly.
2. She is not satisfied with that she has achieved.
3. Mary always thinks of that she can do more for the class.
4. He wrote a letter of thanks to that helped him.
5. It depends on if we have enough time
6. Are you sorry for which you have done?
注意3: 宾语从句经常作表语形容词的宾语此类表语形容词有: afraid, pleased, happy, satisfied, anxious, sure,
surprised, certain, glad, aware
1. I’m afraid (that ) I’ll be late.
2. We were surprised that he lost the game.
注意4: consider find think feel make 等动词常带宾语补足语,这时要用形式宾语 it ,宾语从句放到宾补之后
I consider that we should learn English well necessary.
I consider it necessary that we should learn English well
2. 用who，whom, which, whose, what, when, where, why, how, whoever, whatever, whichever等关联词引导的
宾语从句相当于特殊疑问句，应注意句子语序要用陈述语序。例如：
She always thinks of how she can work well. 她总是在想怎样能把工作做好。
She will give whoever needs help a warm support. 凡需要帮助的人，她都会给予热情的支持。
3. 用w hether或if引导的宾语从句，其主语和谓语的顺序也不能颠倒，仍保持陈述句语序。此外，whethe r
与if 在作“是否”的意思讲时在下列情况下一般只能用whether，不用if：
a. 引导主语从句并在句首时；b. 引导表语从句时；c . 引导从句作介词宾语时；d. 从句后有“or not”时；
e. 后接动词不定式时。f. 引导同位语从句
例如：
Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。
Everything depends on whether we have enough money. 一切要看我们是否有足够的钱。
I wonder whether he will come or not. 我想知道他来还是不来。
Can you tell me whether to go or to stay? 你能否告诉我是去还是留？
肯定句中用 if whether, 否定, 疑定句中用 that
1. I doubt ___ifwhether______he is telling the truth.
2. We never doubt ____that_____ the plan will be carried out .
训练2：if whether
1. I asked her ____ifwhether______ she had a bike.
3. We’re worried about ____whether____ he is safe.
4. I don’t know ____ifwhether_______ he is well or not.
5. I don’t know ___whether_____ or not he is well.
6. I don’t know ___whether____ to go.
7. Does he doubt ____that_____ you are from Austria?
8. I’m doubtful ___ifwhether______ he will agree to this.
5. 注意宾语从句中的时态呼应，当主句动词是现在时，从句根据自身的句子情况，而使用不同时态。例如：
He studies English every day. （从句用一般现在时） He studied English last term. （从句用一般过去时）
I know (that) he will study English next year. （从句用一般将来时）
he has studied English since 1998. （从句用现在完成时）
当主句动词是过去时态（could, would除外），从句则要用相应的过去时态，如一般过去时 ，过去进行时，
过去将来时等；当从句表示的是客观真理，科学原理，自然现象，则从句仍用现在时态。 例如：
The teacher told us that Tom had left us for America．
6. think, believe, imagine, suppo se等等动词引起的否定性宾语从句中，要把上述主句中的动词变为否定式。
即将从句中的否定形式移到 主句中 注意反问句。例如：
We don’t think you are here. 我们认为你不在这。
I don’t believe he will do so. 我相信他不会这样做。
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训练3：correction
1. The emperor was pleased by which the minister told him about it. （what）
2. Are you sorry for that you have annoyed him?(去掉)
3. I find that this should be kept secret for the time being necessary.（it作形式宾语）
4. Can you doubt if she will succeed?（that）
5. I worried about if my brother will return in time.(whether)
6. She said that she has never told a lie.(had)
7. Will you tell me when he leaves for Paris?(will leave)
8. Our football team won the match last Sunday excited all of us.( That our)
9. It looked that he was well prepared for the unexpected challenge.(seemed)
10. That he said moved everyone present.(what)

3、表语从句
在句中作表语的从句叫表语从句。引导表语从句的关联词同主语从句 (11个), 外加as if as though,
，表语从句位于连系动词后，有时用as if引导。其基本结构为：主语 + 系动词 + that从句。例如：
The fact is that we have lost the game. 事实是我们已经输了这场比赛。
That’s just what I want. 这正是我想要的。
This is where our problem lies. 这就是我们的问题所在。
That is why he didn’t come to the meeting. 那就是他为什么不到会的原因。
It looks as if it is going to rain. 看上去天要下雨了。
需要注意的，当主语是reason时，表语从句要用that引导而不是because。例如：
The reason why he was late was that he missed the train by one minute this morning .
【点拨】whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句。

4、 同位语从句
同位语从句说明其前面的名词的具体内容。同位语从句通常由that引 导，可用于同位语从句的名词有
advice、demand、doubt、fact、hope、id ea、information、message、news、order、problem、promise、 question、
request、suggestion、truth、wish、word等。例 如：
The news that we won the game is exciting. 我们赢得这场比赛的消息令人激动。
I have no idea when he will come back home. 我不知道他什么时候回来。
The thought came to him that Mary had probably fallen ill. 他想到可能玛丽生病了。
同位语从句和定语从句的区别：
that作为关系代词，可以引导定语从句，充当句子成分，在从句中作宾语时可以省略； that引导同位语从
句时，起连词的作用，没有实际意义，不充当句子成分，一般不能省略。
试比较下面两个例句:
. 1) Dad made a promise that he would buy me CD player if I passed the English test. （that 不充当任何成分）
2) Dad made a promise that excited all his children.（that指代promise，又在从句中充当主语。）
三，考点索引
考点之一:考查名词性从句中that与what的区别
考例: _______ we can't get seems better than _______ we have.
A. What; what B. What; that C. That; that D. That; what
分析: (注:划线的选项为最佳答案,下同.)在名词性从句中th at与what的区别是:that在名词性从句中不作句
子成分,只起连接作用;而what在名词性 从句中不仅起连接作用,而且作句子成分.句子的意思是:我们不能得
到的似乎比我们已经拥有的要好. 此题考查了两个名词性从句:主语从句和宾语从句,what在这两个名词性从
句中都作宾语.
考点之二:考查名词性从句中的it作形式主语或形式宾语
考例1: _______ is a fact that English is being accepted as an international language.
A. There B. This C. That D. It
分析:在这种名词性从句中为了保持句子的平衡,往往用先行词it作形式 主语或形式宾语,而把真正的主语或
宾语放到后面,尤其是that引导的主语从句往往用先行词it作 形式主语.此句也可以改写为:That English is
being accepted as an international language is a fact.
考例2: I hate _______ when people talk with their mouths full.
A. it B. that C. this D. them
分析:此 题考查的是用先行词it作形式宾语,而把真正的宾语从句放到后面.其他几个词均不能作形式宾语.
考点之三:考查名词性从句的语序
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考例:The photographs will show you _______ .
A. what does our village look like B. what our village looks like
C. how does our village look like D. how our village looks like
分析: 在名词性从句中,除了关联词要提到句首之外,一律要用陈述句语序。当关联词含疑问意义时,有的学生
就会受习惯影响错误地使用疑问句语序。克服这种错误的关键是要找准从句中的主语和谓语。本题句子的
意思是:这些照片会告诉你我们村子是什么样。本题中根据引导词what要作介词like的宾语,而副词ho w不
能作介词like的宾语,所以首先排除C、D,而A项是疑问句语序,故只能选B
考点之四:考查名词性从句中的whether, if以及that的区别
考例1: _______ we'll go camping tomorrow depends on the weather.
A. If B. Whether C. That D. Where
分析:句子的意思是:我们明天是否去野营要视天气而定. whether与if当是 否讲时的区别是:在引导宾
语从句时两者可以互换,但在引导主语从句、表语从句和同位语从句以及介词 后面的宾语从句或后面紧跟
or not时通常只能用whether,而不能用if.
考例2: What the doctors really doubt is _______ my mother will recover from the serious disease soon.
A. when B. how C. whether D. why < br>分析:本题句子的意思:医生真正怀疑的是我母亲是否能很快从重病中恢复过来.whether引导的是 表语从句.
考例3: It worried her a bit _______ her hair was turning gray.
A. while B. that C. if D. for
分析:本题句子的意思是:头发变白使她有点儿不安。It作形式主语,th at引导的是主语从句。whether, if以及
that引导的名词性从句的区别是:wheth er与if(当是否讲时)引导的名词性从句含有疑问意义;而that引导的
名词性从句不含有疑问意 义。
考点之五:考名词性从句中的疑问词+ever引导的名词性从句及其与no matter+疑问词引导的从句的区别
考例 1:It is generally considered unwise to give a child _______ he or she wants.
A. however B. whatever C. whichever D. whenever
分析:本题句子的意思是:一般认为孩子要什么就给什么是不明智的.whatever引导的是宾语从句,A.
however 和D. whenever是不能作宾语的;而C. whichever表示无论哪 一个、无论哪些表示在一定范围内
的人或事物,此处并不涉及一定范围内的人或事物所以也不能选.
考例2: Sarah hopes to become a friend of ______ shares her interests.
A. anyone B. whomever C. whoever D. no matter who
分析:本题句子的意思是:萨拉希望跟自己有共同爱好的人交朋友.疑问词+ever引导的名词性从句与no
matter+疑问词引导的从句的区别是:前者既可以引导名词性从句也可以引导让步状语从句;后者 只能引导让
步状语从句.首先排除D.而选A. anyone则应在其后加who.从句中需要的是主语,所以whomever也不行.
考点之六:考查名词性从句的虚拟语气问题
考例:It is necessary that a college student ______ at least a foreign language.
A. masters B. should master C. mastered D. will master
分析:本题选B.句子的意思是:大学生至 少应该掌握一门外语。It作形式主语,that引导的主语从句中谓
语动词用虚拟语气。
(1) 在主语从句中用来表示惊奇、不相信、惋惜、理应如此等,谓语动词用虚拟语气常用
的句型有:I. It is necessary (important, natural, strange, etc.) that... II. It is a pity(a shame, no wonder, etc.) that...
III. It is suggested (requested, proposed, desired, etc.) that...如: It is strange that she (should) think so.
(2) 表示建议、请求、命令、要 求、坚持等及物动词后面的宾语从句中要用虚拟语气,常用的这类动词
有suggest, propose, insist, desire, demand, request, order, command等。如:
I insist that she (should) do her work alone.
(3) 主语是suggestion, proposal, request, decision等表示建议、请求、要求、决定等意思的词时,表语
从句中谓语动 词要用虚拟语气。如: His suggestion is that we (should) hold another meeting
to discuss the question.
(4) 表示建议、请求、命令、要求、决定等意思的名词后面的同位语从句中谓语动词要用虚拟语气
。如:
They received orders that the work(should)be done at once.
综合训练 组一：2008年组
1. Tomorrow is Tom’s birthday. Have you got any idea the party is to be held?（2008陕西卷）
A. what B. which C. that D. where
2. People in Chongqing are proud of they have achieved in the past ten years. （2008重庆）
A. that B. which C. what D. how
3. The last time we had great fun was _____ we were visiting the Water Park. （2008天津卷）
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A. where B. how C. when D. why
4. ______was most important to her. she told me, was her family. （2008山东）
A. It B. This C. What D. As
5. When asked _____ they needed most, the kids said they wanted to feel important and loved. （2008湖南卷）
A. what B. why C. whom D. which
6. The companies are working together to create they hope will be the best means of transport in the
21
st
century. （2008北京卷）
A. which B. that C. what D. who
7. The news _____ our athletes won another gold medal was reported In yesterday’s newspape（2008上海春招）
A. which B. whether C. what D. that
8. ______ we are sure about is the need to prevent children from being spoiled. （2008上海春招）
A. What B. Which C. Whether D. That
9. _____is known to us all is that the 2008 Olympic Games will take place in Beijing.（2008福建）
A. It B. What C. As D. Which
10. As his best friend, I can make accurate guesses about ____ he will do or think. （2008年上海卷）
A. what B. which C. whom D. that
11. It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in later
life. （2008年上海卷）
A. if B. because C. when D. that
2008年组1—5 BCCCA 6—10 CDABA 11D
组二
is a common belief among them ___rubbish can and should be put to good use .
A. which B. if C. whose D. that
2.__ has been mentioned above, continued chairman after he took a sip of coffee, ____ the project must be carried
out before spring flood comes.
A. As; that B. That; which C. This; which D. It; that
3. David Beckham has ___it take to become a professional football player.
A．who B．what C．which D．that
4. Nobody would stand out admitting the fact, for some reason, they lost the game.
A. that B. which C. what D. why
5.--- The patient looks much better. is it that has made him he is today?
--- Perhaps the special medicine and his family’s patient care.
A．What; that B．That; that C．What; what D．What; which
6. After three hours’ climbing , they reached they thought was the place they’d been dreaming of .
A．what B．which C．where D．that
7. A plan has been put forward __ more graduates should go to work in the country
A. when B. that C. whether D. how
is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

is a new problem involved in the popularity of private cars ____________ road conditions need
____________.
A. that; to be improved B. which; to be improved
C. where; improving D. when; improving
10.______ made the school proud was ______ more that 90% of the students had been admitted to key
universities.
…because …that …what …because
11.— Are you still thinking about yesterday’s game?
— Oh, that’s ____________.
A. what makes me feel excited B. whatever I feel excited about
C. how I feel about it D. when I feel excited
are saying that everyone should be equal, and this is ________ I disagree.
A. why B. where C. what D. How
参考答案和解析：
1.【解析】D “___rubbish can and should be put to good use .”是a common belief的同位语从句，从句中意思
完整,结构完整。
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2.【解析】A“__ has been mentioned above”是定语从句，而“____ the project must be carried out before spring
flood comes.”是动词continued的宾语从句，宾 语从句中句意和结构都完整，故选that，结合第一个空，得
答案A.
3.【解析】B “_______ it takes to be a professional footballer” 做has的宾语，宾语从句中缺少takes的宾语。
句意“贝克拥有成为一名职业足球运动员所需要的 品质”
4.【解析】A“_______ they lost the game.”在句子中做the fact 的同位语从句,从句意思结构完整,结构完整。
5.【解析】C先将句子结构理清楚，it is ___that has made him ___he is today 就可以判断，第一个空是考察
强调句型的特殊疑问形式；第二个空则是表语从句，表语从句中缺少he is的表语。句意：病人好多了，是
什么使得他成为现在这个样子。
6.【解析】A考生误以 为是地点状语从句，误选C．where。而reached是及物动词，后边接的是宾语从句，
宾语从 句除去插入语they thought，应该缺主语。
7.【解析】B 考察同位语从句，表达A plan的具体内容，has been put forward将名词与从句隔开，加大了
难度。
8.【解析】C 主要测试主语从句。分析句子结构可知：句子属于形式主语格式；另外主句中缺少主语 。双
重作用的引导词只能是what。例如：It is still doubtful what he said at the meeting yesterday。昨天他在会上说
的话仍然值得怀疑。
9.【解析】C 主要测试同位语 从句。由句子语境可知句意;有个新的问题卷入私家车行列：道路状况需要改
进。结合同位语从句的定义 可知：问题的具体内容既是：到了状况需要改进。因此属于该句型结构。例如：
There was a new problem put forward at the meeting where we could get the loan。会议上提出一个新问题，我
们到哪儿弄到贷款。
10．【解析】B主要测试主语从句和表语从句。分析句子结构可知：句子______ made the school proud 缺少
主语，另外还要引导主语从句，故此只能选择what，由此 先排除C、D两答案。再结合句子______ more that
90% of the students had been admitted to key universities结构完整 不缺少成分，只需要引导词。句子意思：让
我们学校自豪的是百分之九十多的学生被重点大学录取。
11.【解析】A 主要测试表语从句。此试题测试的重点在于表语从句及起引导词。句子意思：——你 仍在考
虑昨天的比赛吗？———哦，那正是让我感到兴奋的地方。可以利用排除法：B、C、D三个答案 中结构或
句子意思不符合语境。
12.【解析】C主要测试表语从句。解题的关键在于分清句 子中动词disagree的词性：不及物动词。句子意思：
你说每个人应该平等，这正是我不同意的地 方。
【专题综合】
can not figure out ____quit a number of insects ,birds ,and animals are dying out .
A. that B. as C. why D. when
2. After Yang Liwei succeeded in circling the earth ,___our astronauts desire to do is walk in space .
A. where B. what C. that D. How
3. Mary wrote an article on ____the team had failed to win the game .
A. why B. what C. who D. that
4. The place __ the bridge is supposed to be built should be ____the cross-river traffic is the heaviest .
A. which; where B. at which ;which C. at which where D. which in which
5. The shopkeeper didn’t want to sell for __he thought was not enough .
A where B. how C. what D. which
6. A warm thought suddenly came to me ___I might use the pocket money to buy some flowers for my mother’s
birthday .
A. if B. when C. that D. which
7. See the flag on top of the building ? That was ___ we did this morning .
A when B. which C. where D. what
8． The government has announced that a modern city will be set up in ____is still a wasteland now .
A. what B. which C. that D. where
9．Many people wrote articles on ___Liu Xiang had failed to compete in the event .
A. why B. what C. who D. that
10．The couple are spending their holiday on __is described as one of the most beautiful islands .
A. that B. what C. which D. where
11．The book is meant to ___needs it .
A. who B. whoever C. whomever D. whom
his speech, Premier Wen Jiabao points out that creativity is __it takes to keep a nation highly competitive .
A. how B. what C. which D. that
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13．The experience of the Chinese nation attests to a truth____ a nation loses in times of disaster will be made up
for by her progress
A. that what B. what C. that D. what that
14．___has recently been done to provide more buses for the people ,a shortage of public vehicles remains a
serious problem .
spite of what what
15.____is certain is ___prevention is more important than treatment .
that ;that what what
参考答案和解析：
1.【解析】C figure out后接宾语从句，根据从句要表达的意思“为什么很多昆虫，鸟，和动物在逐渐灭绝”
2.【解析】B“our astronauts desire to do”是主语从句，从句中缺少do的宾语
3.【解析】A“the team had failed to win the game”是词on的宾语从句，从句中不缺主干，故排除B和C.再
根据句意 “为什么这个队没能赢”
4.【解析】C“he bridge is supposed to be built”是定语从句，修饰名词place。“he cross-river traffic is the heaviest”
组在句中做表语，表语从句引导词中没有in which，两空结合
5.【解析】C.那位店主不愿意以他认为不够高的价格出售他的商品。本题考 察宾语从句的用法。难度在于“he
thought”的干扰。从句中缺少主语故选C. what
6.【解析】C.句意：我脑海中突然出现一个温情的念头，用我的零花钱给妈妈买些鲜花作为她的生日 礼物。
本题考察名词性从句用法。I might use the pocket money to buy some flowers for my mother’s birthday .做A
warm thought 的同位语从句。中间被suddenly came to me隔开，增加了试题难度。此外，部分考生由于对
同位语从句和定语从句不分，故错选D为答案
7.【解析】D表语从句中缺did的宾语。
8.【解析】A “____is still a wasteland now .”做介词in的宾语从句，从句中缺主语句意为：政府已经宣布一
座现代化的城市将在这片现在仍是废墟的地方建成。
9.【解析】A“___Liu Xiang had failed to compete in the event .”做介词on的宾语，宾语从句 中不缺主干，故
排除B和C。另外that不引导介词的宾语从句（固定搭配除外），所以排除D。
10【解析】B “__is described as one of the most beautiful islands .”宾语从句，从句中缺少主语，
11.【解析】B who ever在宾语从句中做主语，部分学生，因为只看到介词to，误认为要添whomever做介
词的 宾语。
12【解析】B “__it takes to keep a nation highly competitive .”做表语从句，从句中缺少takes的宾语，构成 it
takes sth to do sth 结构。
13【解析】A本题句子结构比较复杂，“____ a nation loses in times of disaster will be made up for by her
progress”做a truth的同位语从句，同位语从句中____ a nation loses in times of disaster为主语从句。本句共
有两个从句，故有两个引 导词。句意为“中华民族的经验证明了一个真理，即，一个民族在灾难中失去的，
必将从民族的进步中得 到补偿。
14.【解析】C “___has recently been done to provide more buses for the people”在句中做让步状语,而D. Though
what错误,因为,一个单一的从句不能用两个连词引导.句意:尽管在为人们提供更 多公交车这件事上,投入了
很多,但是公交工具的缺乏,仍然是个问题.
15【解析】B “____is certain”在句中做主语,主语从句缺少一个主语,需要用What; “___prevention is more
important than treatment .”系表语从句,句意与结构完整,只有that,可以这样用。
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