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?
那个正确?为什么呢?
英语人气:137 ℃时间:2019-08-19 19:12:11
优质解答
It is three years since he joined the League. 这个正确
It is/has been+some time +since sb. did sth.这是固定结构, " 自从某人做某事以来有...时间了."since从句中谓动只能用过去式.
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