Great changes__place in China since 1978.A.have been taken B.have taken C.has been taken D.took可为什么不用被动语态呢?

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Great changes__place in China since 1978.
A.have been taken B.have taken C.has been taken D.took
可为什么不用被动语态呢?

B
因为changes是复数,所以谓语动词用复数
since是自从,需要用完成时态

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