问题
选择题
—It’s difficult for the village children to cross the river to get to school. We think a bridge_______over the river.
A．was built
B．should be built
C．has been built
D．is being built
答案
答案：B
题目分析：句意：对于村里的孩子过河去上学是困难的。我认为在河上应该建一座桥。桥是动作的承受者，作主语，故用被动结构。含有情态动词的被动结构：情态动词+ be +done. 故选B。