It still remains a question _____ life exists on any other planet in the solar s
题型：不详难度：来源：
It still remains a question _____ life exists on any other planet in the solar system. | A．why | B．whether | C．how | D．where |
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答案
| B |
解析
试题分析：考查主语从句。本题中的it是形式主语，真正的主语从句是后面的whether life exists on any other planet in the solar system. 句意:在太阳系里的其它星球上是否存在着生命这件事情仍然是一个问题。根据句意说明本题的主语从句表示的是疑问的句意。ACD的语义和句意不符。故B正确。
点评：在句中作主语的名词性从句称为主语从句，主语从句所对应的谓语动词通常用第三人称单数的形式。为了整个句子的平衡，主语从句经常后置，并用it充当形式主语(此时， that引导的主语从句若不放在句首，可以省略引导词that)。解答这类题目，关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义，来选择正确的引导词。 |
举一反三
He left home without saying a word, and _______ worries many people and is to be found out. | A．where he has gone | B．where did he go | | C．which place has he gone | D．where has he gone |
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It is still under discussion _________ the old bus station should be replaced with a modern hotel or not.| A．whether | B．when | C．which | D．where |
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| _______ excited her parents most was that he was admitted to his dream college. |
Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.| A．it; what | B．what; what | C．what; it | D．it; it |
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___ in the regulations is that you ___ other people the password of your e-mail account．
A．What is required; not tell B As is required; shouldn"t tell
C．It is required; not tell D．It requires; shouldn"t tell |
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