Great changes in the past few years, and a lot of factories .
A. had taken place; have been set up
B. have taken place; have been set up
C. took place; have set up
D. were taken place; were set up
网友回答
A. had taken place; have been set up
(答案→)B. have taken place; have been set up
C. took place; have set up
D. were taken place; were set up
解析：句意：在过去的几年里发生了很大变化，许多工厂都建立起来了。根据in the past few years可知与现在完成时连用，又因为take place没有被动语态，factories与set up之间是被动关系，故选B。