— It’s difficult for the village children to cross the river for school. —I think a bridge ______ over the river.

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问题 — It’s difficult for the village children to cross the river for school.
   —I think a bridge ______ over the river.

选项 A、was built
B、is being built
C、has been built
D、should be built

答案D

解析 考查情态动词的被动语态。其结构为:情态动词+be+过去分词。由下句“我认为应当在河上建一座桥”可知选D。
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