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It was never clear ________ the man hadn't reported the accident sooner.(2011·江苏)
A.thatB.howC.whenD.why
D
句意:那个男士为什么没有及时举报事故尚不清楚。分析句子成分可知,此处是一个主语从句,再结合句意可知应用why引导。
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