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It ____ five years since he has left for Beijing.A.was B.has been C.is D.is going to be这道题选哪项,为什么?请说明原因,

题目详情
It ____ five years since he has left for Beijing.A.was B.has been C.is D.is going to be
这道题选哪项,为什么?请说明原因,
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答案和解析
B,since用现在完成时