Great changes in China in the past 20 years.A. took placeB. have taken placeC. were taken

问题补充：

Great changes in China in the past 20 years.

A. took place

B. have taken place

C. were taken place

D. have been taken place

答案：

A. took place

(答案→)B. have taken place

C. were taken place

D. have been taken place

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