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.
it is four years since I joined the army.这里的is,为什么不用was呢?
it is four years since I joined the army.这里的is,为什么不用was呢?
英语人气：681 ℃时间：2019-11-04 14:33:21
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