问题补充:
— It’s difficult for the village children to cross the river for school.
— I hear a new bridge over the river in a year.
A. was built
B. is being built
C. has been built
D. will be built
答案:
A. was built
B. is being built
C. has been built
(答案→)D. will be built
解析:根据后文的内容“in a year”可知答案为一般讲来时,有根据句子的要求为被动语态,故选D