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should have done和shouldn't have done,couldn't have

分类: 作业答案 • 2021-12-19 22:20:59

问题描述：

should have done和shouldn't have done,couldn't have

答

should have done:本应该做了某事
shouldn't have done:本不应做某事
could't have done ：（表推测）不可能做了某事

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