【题目】It was never clear ________ the man hadn't reported the accident sooner.
A.thatB.howC.whenD.why
在线课程【答案】D
【解析】
考查主语从句。句意：这一直不清楚为什么那个人没有早点报告这起事故。根据句中的never clear可知，是指不清楚其中不报道的原因；why“为什么”，在句子充当原因状语。It在句中是形式主语，真正的主语是why引导的主语从句。故选D
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