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
根据句意“对于乡村的孩子来说，穿过那条河去上学是困难的。”“我们认为，应该在河上修一座桥。”A、C、D的时态不符，B项符合题意。故选B。