It was never clear _______ the man hadn’t reported the accident sooner.
A．thatB．howC．whenD．why
D
D【命題動(dòng)向】考查名詞性從句。
解析一：It做形式主語，真實(shí)主語由后面的句子來充當(dāng)。從主語從句的句子成分看，表示原因是最恰當(dāng)?shù)�。句意為：那個(gè)人并沒有早點(diǎn)兒報(bào)告這次事故，其原因還不清楚。
解析二：本題意為“不清楚為什么這個(gè)男人沒有及早匯報(bào)這個(gè)事故�！眎t是本句的形式主語，why引導(dǎo)的從句是真正的主語，表示原因。B選項(xiàng)放在句中句意不通，C選項(xiàng)when表示一個(gè)時(shí)間點(diǎn)，不能和完成時(shí)連用。A選項(xiàng)that放在句中句意不通。
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