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    精英家教网 > 高中英语 > 题目详情
    It still remains a question _____ life exists on any other planet in the solar system.
    A．whyB．whether C．howD．where
    B

    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。
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