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【题目】_____ 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】

试题分析:考查主语从句的引导词。why 为什么;whether是否;how 如何;where 何处。分析句子结构可知_____ life exists on any other planet in the solar system是本句的主语,是一个主语从句;根据语境在太阳系的其他星球是否存在生命仍是个谜可知whether符合语境,故选B。

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