Something must be done to prevent our city by thick smoke.A. to be polluted B. from polluti——青夏教育精英家教网—

摘要： Something must be done to prevent our city by thick smoke.A. to be polluted B. from polluting C. from being polluted D. polluting

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Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

Something must be done to prevent our city ____ by thick smoke.

A. to be polluted B. from polluting C. from being polluted D. polluting

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