the young man has been a doctor _______.
A.five years ago
B.since five years befoe
C.for five years
D.since five years ago
B和D有什么根本上的区别吗?
C是 for five year .
人气：167 ℃ 时间：2019-12-25 08:01:35
解答
C B是错的 D表示的是自从5年前.这里是指已经5年了C是 for five year. 没有加S的。那就选D为什么B是错的？B前面不加.since
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