We don't know when the accident________.A.has happened B.happened C.happening D.to happen
We don't know when the accident________.A.has happened B.happened C.happening D.to happen
英语人气：460 ℃时间：2019-12-18 01:17:46
优质解答
B为什么？宾语从句中 the accident发生在过去，就用一般过去时；happening 和to happen无法单独做句中的谓语动词部分；不考虑过去的动作对现在 的影响，就不用现在完成时。
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