27. Great changes in our city in the past twenty years.A. have been taken placeB. have tak

问题补充：

27. Great changes in our city in the past twenty years.

A. have been taken place

B. have taken place

C. took place

D. were taken place

答案：

A. have been taken place

(答案→)B. have taken place

C. took place

D. were taken place

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