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 查看更多

 

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The air in big cities _____very dirty by factories.

A. are often made         B. is often made       C. have often madeD. has often made

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The air in big cities _____very dirty by factories.

A.a(chǎn)re often made

B.is often made

C.have often made

D.has often made

 

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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

 

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