题目内容

It was never clear _______ the man hadn’t reported the accident sooner.
A．thatB．howC．whenD．why
D
D【命题动向】考查名词性从句。
解析一：It做形式主语，真实主语由后面的句子来充当。从主语从句的句子成分看，表示原因是最恰当的。句意为：那个人并没有早点儿报告这次事故，其原因还不清楚。
解析二：本题意为“不清楚为什么这个男人没有及早汇报这个事故。”it是本句的形式主语，why引导的从句是真正的主语，表示原因。B选项放在句中句意不通，C选项when表示一个时间点，不能和完成时连用。A选项that放在句中句意不通。
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