题目内容

_____ 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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