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

A.should be built% B0 N9 S1 M4 ?) S' M/ j B.is being built( \0 b" e2 a/ N C.has been built- L7 R* X8 B* X3 A, H" I- h D.was built0 G/ \) \; Y( G$ Y

答案A

解析