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HAV BEEN DOING STH为什么要加BEEN?

分类: 作业答案 • 2022-07-11 21:02:01

问题描述：

答

因为他是现在完成进行时的表达.
进行时的框架是 be + doing
而这里因为是现在完成时所以be就是用的过去分词变成了been.
希望楼主弄明白、

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HAV BEEN DOING STH为什么要加BEEN?

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