问题 单项选择题

Great changes ()in our country since twenty years ago.

A.have taken place

B.have been taken place

C.took place

D.have been happened

答案

参考答案:A

解析:

由since看出应用现在完成时,happen为不及物动词,不能用被动语态。故选A。

单项选择题
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