It has been two years we left school.A. sinceB. whenC. beforeD. as

发布时间：2020-08-16 16:35:19

It has been two years      we left school.  
A. since
B. when
C. before
D. as

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(答案→)A. since
B. when
C. before
D. as
解析：这题考查连词的用法：句型是：It is/has been +一段时间+since“自从…有多久了”，句意是：自从我们毕业有两年了。选A。
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