It was never clear _____the man hadn’t reported the accident sooner.
A．thatB．howC．whenD．why
D
考查主語從句。句意：這名男子沒有早點報告這次事故的原因根本沒有搞清楚。It在句中是形式主語，真正的主語是why引導(dǎo)的主語從句。
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