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