It has been five years since he has left for beijing这句话对不对啊

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It has been five years since he has left for beijing这句话对不对啊
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It has been five years since he has left for beijing这句话对不对啊
It has been five years since he has left for beijing这句话对不对啊

It has been five years since he has left for beijing这句话对不对啊
It has been five years since he left for beijing
since后用一般时

不对
老师讲过 it ( is going to be) five years since he has left for beijing

错It is five years since he has left for beijing
固定的
硬要说原因的话实际主语是he left for beijing,不是it,句子做主语表示事件没有时态

It has been five years since he had left for beijing

应该用It has been five years since he left for Beijing.