It ( ) seven years since he began to teach English here.a.is b.have beenc.has d.is for要理由的

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It ( ) seven years since he began to teach English here.a.is b.have beenc.has d.is for要理由的
It ( ) seven years since he began to teach English here.
a.is b.have been
c.has d.is for要理由的

It ( ) seven years since he began to teach English here.a.is b.have beenc.has d.is for要理由的
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

B。现在完成时。