2.
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【即境活用】
Much to his surprise，he invited only twenty friends to the dinner，but came．A．twice as many as B．as many as twice C．twice as many D．twice more than 答案：C
语法核心突破
Noun clauses as the subject 主语从句
1．定义：
主语从句：在复合句中充当主语的句子叫主语从句例如： How he was successful is still a puzzle. 他是如何成功的仍然是个谜。 2. 连接词的选用 （1）that和what的选用
that和what都可引导主语从句。what除起连接作用外，还在名词性从句中充当某些成分，可作从句的主语、宾语或表语。而that在名词性从句中不充当任何成分，无词义，只起连接词作用如：
What he wants is a book. 他想要的是一本书
That light travels in straight lines is known to all. 众所周知，光线沿直线运行 （2）if和whether的选用
引导主语从句，不能用if，只能用whether。如：
Whether we will hold a party in the open air tomorrow depends on the weather. 我们明天是否在户外开晚会要看天气而定 （3）其它连接代词和副词的选用
根据主语从句的具体意义，正确的选择who, which, when, where, why, how等连接词，这些
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连接词既有疑问含义，又起连接作用，同时在从句中充当各种成分如： When we shall hold our sports meet is not decided. 我们何时举行运动会还没有决定。 Who broke the glass yesterday is not clear. 还不清楚昨天谁打破了玻璃
Which car you will choose to buy makes no difference. 你决定买哪一辆车都不会有任何区别 （4）whatever / whoever的功用
whatever, whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。whatever = anything that; whoever = anyone who。要注意和whatever, whoever引导的让步状语从句的区别如：
Whoever breaks the law should be punished. （主语从句） （＝Anyone who breaks the law should be punished. ）
Whoever breaks the law, he should be punished. （让步状语从句） （＝No matter who breaks the law, he should be punished. ） 3. it构成的主语从句
（1）由连词that引导的主语从句，在大多数情况下会放到句子的后面，而用代词it作形式主语。如：
It is well-known that the earth moves around the sun. 众所周知，地球围绕太阳转。 【拓展延伸】
需要注意的是，it作形式主语代替主语从句时，要注意和as引导的定语从句的区别。试比较：
It was reported that the US was under the terrorist attack. （主语从句，有that，无逗号） As was reported, the US was under the terrorist attack. （定语从句，无that，有逗号）
上两句意为―据报道，美国遭到恐怖分子的袭击‖ （2）常见用it作形式主语的复合句结构
It is a fact （a good idea / a pity / a shame / no wonder / good news…）that…如： It’s a pity that you missed the film.
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你没有看那部电影真是太遗憾了
It is necessary （clear / true / strange/ important /wonderful / possible / likely…）that… 需要注意的是，这类主语从句中，谓语动词很多为―（should）＋动词原形‖，即要用虚拟语气如：
It is necessary that you （should）master the computer. 你很有必要掌握电脑
It is important that a student learn English well. 学生学好英语很重要
It’s clear that they badly need help. 很明显，他们急需援助
It is likely that a hurricane will arrive soon. 飓风很可能马上就要到达了。
It is reported （well-known / hoped / thought / expected /said /believed/decided /suggested /ordered…）that…如：
It is said that he was killed in the earthquake. 据说他在地震中丧生了
It seems （happened / appears / doesn’t matter / makes no difference / …）that …如： It seems that they will win the game. 看起来他们好像会赢得这场比赛 It makes no difference whether he will attend the meeting or not.
【典型例题】
1、_____ in the regulations that you should not tell other people the password of your e-mail account.
A. What is required B. What requires C. It is required D. It requires
【解析】C。 本句的结构为It is +动词的过去分词+that 引导主语从句。经常用于这种结构的动词还有say, report, think, hope, expect, consider, suggest等
2._________made the school proud was_________ more than 90% of the students had been admitted to key universities.
A. What; because B. What; that C. That; what D. That; because
【解析】B。 what引导主语从句，在主语从句中作主语；that引导表语从句，在表语从句中起连接作用
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3、________she couldn't understand was ________fewer and fewer students showed interest in her lessons.
A. What...why B. That...what C. What...because D. Why...that
【解析】A。 主语从句she couldn't understand缺少宾语，要用What引导。表语从句fewer and fewer students showed interest in her lessons是一个完整的句子，要用why引导，意思是―为什么越来越少的学生对她的课感兴趣‖
【语法专练】
1. I’m sure that it is obvious _______ Gina was lying for I saw her in the street yesterday. A. which B. that C. because D. when
2. ______breaks the rules should be punished and fined at least 200 yuan. A. No matter whom B. No matter who C. Whomever D. Whoever
3. _____ is known to us all is that the 2008 Olympic Games will take place in Beijing. A. It B. What C. As D. Which 4. ---What made him so upset?
---______she failed in her examination.
A. What B. That C. Because D. Whether
5. Determination is a kind of basic quality and this is _______ it takes to do jobs well. 世纪金榜 A. what B. that C. which
D. who 世
6. Along with his letter was his promise he would attend the opening ceremony the Coming month. A. which B. that
C. what D. whether
7. The reform has changed the whole nation. It cannot remain _________ it used to be. A. what B. where C. which D. when 8. What I want to know is ________ the price of oil is still rising. A. when
B. how
C. why
D. that
答案：1~5 BDBBA 6~8 BAC
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