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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