Great changes ______ in Shanghai since the beginning of the reform and opening-up policy. A. took place B. has taken place C. has been taken place D. have taken place

Great changes ______ in Shanghai since the beginning of the reform and opening-up policy.
A. took place
B. has taken place
C. has been taken place
D. have taken place

出自：中北大学-大学英语1

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