The air in big cities ______ very dirty by factories.A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好

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The air in big cities ______ very dirty by factories.A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好
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The air in big cities ______ very dirty by factories.A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好
The air in big cities ______ very dirty by factories.
A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好

The air in big cities ______ very dirty by factories.A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好
应该选B 被动语态 应该是be+动词的过去分词 只有B对
希望对你有所帮助,有不明白的再问吧

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