Great changes?the last three years.A.have taken place B.have been taken place C.have happenedD.have been happened

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Great changes?the last three years.A.have taken place B.have been taken place C.have happenedD.have been happened
Great changes?the last three years.A.have taken place B.have been taken place C.have happened
D.have been happened

Great changes?the last three years.A.have taken place B.have been taken place C.have happenedD.have been happened
take place 是点时间,只能表示某一时刻的动作 happen可以表状态 后跟段时间
the last three years是一段时间,所以要用happen

A.have taken place