问题
选择题
—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
答案：D
题目分析：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