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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