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问一道英文题目~05Theaccident(couldhavebeen)causedbyadogrunningacrosstheroad,butwedon'tknowforsure.为什么括号里词不用mighthave?理由?

题目详情
问一道英文题目~05
The accident (could have been)caused by a dog running across the road,but we don't know for sure.
为什么括号里词不用might have?理由?
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答案和解析
could have been表虚拟吧.