--It’sdifficultforthevillagechildrentocrosstheriverfors...

问题详情：

--It’s difficult for the village children to cross the river for school.

    --I think a bridge _______ over the river.

A. should be built        B. is being built     C. has been built          D. was built

【回答】

A

知识点：动词语态

题型：选择题