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28.Great changes ___ in the city,and a lot of f

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28.Great changes ___ in the city,and a lot of f
actories ___.
A .have been taken place; have been set up
B .have taken place; have been set up
C .have taken place; have set up
D .were taken place; were set up
前一句主动后一句被动选B
再问: 被动为什么不能用were set up啊
再答: 因为受前一空限制,changes只能是have taken 或took place
再答: 求采纳