题目内容

--- It’s difficult for the village children to cross the river for school.
--- I think a bridge _______ over the river.
A.should be builtB.is being builtC.has been builtD.was built
A
由题意判断是桥还没建起来。B C D 的意思是 建起来了  A 应该被建,但还没建
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