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英语
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We don't know when the accident________.A.has happened B.happened C.happening D.to happen
人气:357 ℃ 时间:2019-12-18 01:17:46
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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