It was never clear ________ the man hadn"t reported the accident sooner.(2011·江苏
题型：不详难度：来源：
| It was never clear ________ the man hadn"t reported the accident sooner.(2011·江苏) |
答案
| D |
解析
| 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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