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would/could/must have done在虚拟语气中怎么用?

分类: 作业答案 • 2021-11-12 23:35:51

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would have done本来想要做某事（却没做）could have done 本来能够做某事（却没做）must have done 过去一定做了某事（对过去发生事情肯定的推测）,这三个情态动词加have done,都是对过去发生事情的虚拟,从时态的角度讲是一种过去时.

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would/could/must have done在虚拟语气中怎么用?

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