题目内容

It was never clear _____the man hadn’t reported the accident sooner.
A．thatB．howC．whenD．why
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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