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英语
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It must have been about two in the morning when I returned home .must have been 是什么语法
为什么加been
人气:435 ℃ 时间:2020-03-31 20:52:31
解答
情态动词加完成时,表示对过去的肯定推测
should have done 表示本应该做,实际没做
为什么加been
因为是be的过去分词,be about 用完成时,就是have been ...
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