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_____ life exists on any other planet in...

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

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

 

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。 考点:考查主语从句  
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