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Great changes ________ in the city,and a lot of factories __

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Great changes ________ in the city,and a lot of factories ________.
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
Great changes ________ in the city,and a lot of factories __
答案B
前一空用现在完成时是因为“变化”在过去发生,并持续到现在并可能持续下去.注意,take place无被动式,因此可排除A、D两项;后一空用现在完成时,根据意义用被动语态.