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It was never clear ________ the man hadn't reported the accident sooner.(2011·江苏)

A.that B.how C.when D.why

 

D

【解析】D [考查主语从句。句意:这名男子没有早点报告这次事故的原因根本没有搞清楚。It在句中是形式主语,真正的主语是why引导的主语从句。]

 

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