can have done和 could have done有什么区别?

问题描述:

can have done和 could have done有什么区别?
那can have done什么用法?
1个回答 分类:英语 2014-12-12

问题解答:

我来补答
could have done语气婉转 且是can have done得过去式
 
 
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