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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 built6 ^% @, U! G) e/ e B.is being built# j+ J# [8 A/ T8 V. I' T C.has been built( L. I3 N& J, K2 D X7 D) ?0 ]' j& d: g D.was built
- ? i$ D; L7 R7 B

答案A

解析