问题补充：
Great changes in the city since1970.
A. have been taken place
B. have taken place.
C. has taken place
D. took place
答案：
A. have been taken place
(答案→)B. have taken place.
C. has taken place
D. took place
解析：句意：自从1970年，在这座城市里发生了很大的变化。分析从时间上体现了现在完成时，主语又是复数形式，因此用take place发生，现在完成时形式。故选B
