精英家教網 > 高中英語 > 題目詳情
It still remains a question _____ life exists on any other planet in the solar system.
A．whyB．whether C．howD．where
B

試題分析：考查主語從句。本題中的it是形式主語，真正的主語從句是后面的whether life exists on any other planet in the solar system. 句意:在太陽系里的其它星球上是否存在著生命這件事情仍然是一個問題。根據句意說明本題的主語從句表示的是疑問的句意。ACD的語義和句意不符。故B正確。
點評：在句中作主語的名詞性從句稱為主語從句，主語從句所對應的謂語動詞通常用第三人稱單數的形式。為了整個句子的平衡，主語從句經常后置，并用it充當形式主語(此時， that引導的主語從句若不放在句首，可以省略引導詞that)。解答這類題目，關鍵在于分析清楚句子結構。通過判斷引導詞在從句中所作的成分及意義，來選擇正確的引導詞。
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