We are having a class get-together. It’s been twenty years we graduated from high school.

发布时间：2020-08-16 16:35:37

We are having a class get-together. It’s been twenty years      we graduated from high school.
A. before
B. since
C. after
D. when

网友回答

A. before
(答案→)B. since
C. after
D. when
解析：考查句型：It is/has been+时间段+since后用一般过去式，自从什么时候起已有一段时间了。故选B。
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