as引导的定语从句（三）

分组对比练习

as与which

1. _____ is often the case, we have worked out the production plan.（2004,江苏）

A．Which   B．When   C．What   D．As 

分析：as引导评述性状语从句，可以放在主句前，也可以放在主句后。which引导定语从句，不能放在主句前，只能放在主句后。选D。

2. A lot of language learning, ____has been discovered, is happening in the first year of life, so parents should talk much to their children during that period .（2012,安徽） A．as   B．it   C．which   D．this 

句意：正如研究发现，很多语言学习发生在出生后的第一年，所以，在那个阶段，父母应该多和孩子说话。选A。

3. The owner of the cinema needed to make a lot of improvements and emply more people to keep it running, ____meant spending tens of thousands of pounds.(2006,江苏)  A.who   B.that   C.as   D.which

分析：which (代词)在从句中作成分（作主语），as (连词)在从句中不作成分。选D。

4. If the man is only interested in your looks, ____ just shows how shallow he is. (陷阱题)

A. as   B. which   C. what   D. that

分析：容易误认为逗号后是非限制性定语从句，从而误选A或B。其实，注意逗号前是一个条件状语从句，逗号后是该状语从句的主句，that 在此代表前文所述的情况，用作主句的主语。选D。

5. —Who should be responsible for the accident?—The boss, not the workers.They just carried out the order____.（2008,福建）   A．as told   B．as are told   C．as telling   D．as they told 

as/it/what

1. _____ is known to everybody, the moon travels round the earth once every month.（全国卷）

A. It   B. As   C. That   D. What   选B。

2. The air quality in the city, ____is shown in the report, has improved over the past two months. (2012,福建)

A. that   B. it   C. as   D. what

句意：正如报告中所写的那样，在过去的两个月中，这座城市的空气质量提高了。

分析：把从句放在句首就很明白了:    is shown in the report, the air quality in the city has improved over the past two months. “正如在报告中所写的那样”，as指的是下文所提到的话。选C。

3. ____ in the regulations that you should not tell other people the password of your email account.（上海高考题）   A. What is required   B. What requires is   C. It is required   D. It requires 

句意：规则要求你不应把你的电子邮件的密码告诉别人。选C。

4. ____ was most important to her, she told me, was her family. (2008,山东).

A. It   B. This   C. What   D. As  

分析：what是主语从句的引导词，其余都不是。选C。

5. Everyone knows that ____ is dangerous to play with fire，but ____ is difficult is to prevent children from playing with fire. (陷阱题).   A. it, it   B. what, what  C. it, what  D. what, it

分析：容易误选A或B。其实，第一空填形式主语it，真正的主语是其后的不定式 to play with fire。第二空填 what，what is difficult 是主语从句（注意到what is difficult 后有is，若没有这个is，则第二空也填it）。答案是C。

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