---It’s difficult for the village children to cross the river to get to school.---We think a bridge ________ over the river.A.was builtB.should be builtC.has been builtD.is being built
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B解析根据句意“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。