Great changes __________ in China in the past few years.

A． were taken place

B． took place

C． have been taken place

D． have taken place

下列属于20世纪90年代发达国家郊区化特点的是( )。

A．就业岗位增加，郊区增加

B．中心市区人口减少，郊区人口迅速增长

C．郊区新城与中心市区的共生关系越来越不紧密

D．中心市区减少

E．边缘新城的形成