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17._____ life exists on any other planet in the solar system still remains a question.(  )
A.WhyB.WhetherC.HowD.Where

分析 是否生命存在于太阳系的任何其他行星上仍然是个问题

解答 答案:B.根据 still remains a question说明前面整句是主语从句,而主语从句 life exists on any other planet in the solar system 可知句子完整,不缺成分,排除ACD,再根据句意,是否生命存在于太阳系的任何其他行星上仍然是个问题,故选B.whether是否

点评 本题考查主语从句的连接词,在充分分析句型基础上以及熟知whether词义的情况下便能选出正确答案.

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