问题
选择题
--- 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
答案
答案：A
考查时态和被动语态。“对乡村的孩子来说，跨过这条河去上学时困难的。”“我想应该在河上建一座桥。”根据答语可知，桥还没建，是将来时；B项是现在进行时，C项是现在完成时，D项是过去时，故排除B、C、D。A项表示将来。故选A。