mei lin has been a teacher ---.a.since two years b.since two

mei lin has been a teacher ---.a.since two years b.since two Lin Tao has been a teacher ()答案是since two years ago 为什么不能是si My brother has been a soldier since two years and a half.(划线 My aunt has been a teacher ____ten years ago.A.for B.since C The supermarket ___ since two years ago.A.was open B.has bee Mary has come back from China______.A.for two years B.since Tom has been on the island since two years.(改错) it is two years since I came here还是it has been two years sin When did you study in france?A,Two years ago B,Since two yea It's over two years since I have become a teacher改错 It has been ten years since I ___(be) a teacher. the actor and director_______(move) abroad since two years a