Question

【题目】— It's difficult for the village children to cross the river to get to school.
— I think a bridge ________ over the river.

A.should be built
B.should build
C.was built
D.has been built

Answer 1

【答案】A
【解析】句意：对于这个村的孩子们来说过河去上学很困难。——我认为应该在河上建一座桥。结合语境可知从句中描述的是对客观动作的虚拟，故用should虚拟语气，从句主语是动作对象，故用被动语态，选A。