Great changes in China in the past 20 years. A.are taking place B.have been taken place C——青夏教育精英家教网—

摘要：Great changes in China in the past 20 years. A.are taking place B.have been taken place C.have taken place D.are being taken place

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Great changes _____ in China in the past 20 years.

A. have taken place B. have been taken place

C. took place D. are taking place

Great changes _____ in China in the past 20 years.

A. have taken place B. have been taken place

C. took place D. are taking place

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