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since用于什么时态举个问题:hehasneverborrowedanymoneyfromthewriter.ALastweekBUptillnowCSinceDAweekago]选哪一个,为什么.

题目详情
since用于什么时态
举个问题: he has never borrowed any money from the writer.
A Last week B Up till now C Since D A week ago]
选哪一个,为什么.
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答案和解析
选 B 【直到现在,独立的词组,用于现在完成时】A D 是过去时的标志.
since ( 自从)+ 过去时的短语或句子.才能用于现在完成时.
如:He has lived here since two years ago .或 He has lived here since he was born .