t is three years since he joined the League?it is three years since he has joined the League?

t is three years since he joined the League?it is three years since he has joined the League?

题目
t is three years since he joined the League?it is three years since he has joined the League?
那个正确?为什么呢?
答案
It is three years since he joined the League. 这个正确
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