单选题 Great changes ______ in the city, and a lot of buildings ______ ．
   A．has 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
【正确答案】 B
【答案解析】take place(发生)没有被动形式，set up(建立)需用被动。