It ( ) seven years since he began to teach English here.

It ( ) seven years since he began to teach English here.

题目
It ( ) seven years since he began to teach English here.
a.is b.have been
c.has d.is for要理由的
答案
选a,叙述客观事实,从过那一科开始持续到现在,还可能再持续下去
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