Great changes in our country since 1990.A. were taken placeB. took placeC. have taken pla

问题补充：

Great changes in our country since 1990.

A. were taken place

B. took place

C. have taken place

D. have been taken place

答案：

A. were taken place

B. took place

(答案→)C. have taken place

D. have been taken place

解析：考查被动语态和现在完成时。句意“自从1990年以来，我们国家复数了巨大的变化。”take place没有被动形式，排除A、D；since+时间点常用于现在完成时。故选C。