【題目】_____ life exists on any other planet in the solar system still remains a question.

A. Why B. Whether C. How D. Where

【答案】B

【解析】

試題分析:考查主語從句的引導詞。why 為什么;whether是否;how 如何;where 何處。分析句子結(jié)構(gòu)可知_____ life exists on any other planet in the solar system是本句的主語,是一個主語從句;根據(jù)語境在太陽系的其他星球是否存在生命仍是個謎可知whether符合語境,故選B。

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