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英语
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it is four years since I joined the army.这里的is,为什么不用was呢?
人气:279 ℃ 时间:2019-11-04 14:33:21
解答
since引导的从句用一般过去时,对应主句用现在完成时,has been可以换成is
since意思是 自从...到现在.
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