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It _____ five years since I came to this city.

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It _____ five years since I came to this city.
A.was B.is C.will be D.had been
正确答案为is,为什么是is .has又行不行呢
It _____ five years since I came to this city.
该句的意思是 从我来这个城市到现在已经五年了.如果用has必须用has been
这是过去到当下时间段的描述 适合用is 过去时态、将来时和过去完成时都不对