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_____ life exists on any other planet in the solar system still remains a question.
A.WhyB.Whether C.How D.Where
B

试题分析:考查主语从句:句意:是否在太阳系的其他星球上有生命的存在还是个问题。通过句意判断应该是whether连接主语从句,选B。
点评:如果主语从句缺少主宾表,用what连接主语从句,如果不缺成分,用that连接,引导主语从句的that在从句中不做成分,只起到连接的作用,学生要会分析句子成分。表语从句也是这样。
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