—It’s difficult for the villagers to cross the river for market.—I think a bridge over th

问题补充：

—It’s difficult for the villagers to cross the river for market.

—I think a bridge over the river.

A. was built

B. is being built

C. has been built

D. should be built

答案：

A. was built

B. is being built

C. has been built

(答案→)D. should be built

解析：句意：--对于村民们穿过这条河流去市场是很困难的。--我想一座桥应该被修建在河上。考查被动语态的用法，此处对话中提出的是建议，所以用情态动词的被动语态形式。 故选D