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英语
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have been done 这个是什么时态的结构
人气:222 ℃ 时间:2019-08-17 15:57:07
解答
1 have ( has ) + done 现在完成时 ,had +done 是过去完成时 .
2 be ( am ,is are ) + done 是被动语态
3 have been done 是现在完成时的被动语态
4 have been doing 是现在完成进行时
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