The roads have because of people’s dependence on cars.A. jammedB. been jammingC. to jamD.

问题补充：

The roads have because of people’s dependence on cars.

A. jammed

B. been jamming

C. to jam

D. been jammed

答案：

A. jammed

B. been jamming

C. to jam

(答案→)D. been jammed

解析：考查语态。句意：公路变得拥挤了，因为人们对汽车的依赖。可知公路是被堵塞的对象，故用被动语态选D。