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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 【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．are 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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