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英语
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__he entered the university,his english has been much improved.A after B since C before
A和C用于怎样的句子中?
人气：309 ℃ 时间：2019-08-21 12:56:57
解答
after和before如果置于句首,有两种情况,一是充当介词角色,它们后面接的是动名词,即动词的ing形式；二是作为连词,引导的是从句,后面的主句应该用一般过去式.
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