问题
Great changes ______ in the city and a lot of buildings ______.
A:have taken place, have been set up
B:have been taken place, have been set up
C:were taken place, were set up
D:have taken place, set up
B:have been taken place, have been set up
C:were taken place, were set up
D:have taken place, set up
正确答案是：
