问题补充：
Great changes in the city in the past 20 years, and a lot of factories .
A. have been taken place; have been set up
B. have taken place; have set up
C. have taken place; have been set up
D. were taken place; were set up
答案：
A. have been taken place; have been set up
B. have taken place; have set up
(答案→)C. have taken place; have been set up
D. were taken place; were set up
解析：句意：在过去的里，这个城市发生了巨大的变化，已经建立了许多的工厂。句中有in the past 20 years句子要用现在完成时，take place发生，无被动形式，set up建立，有被动形式，故选C
