Something must be done to prevent factories sending out poisonous gases so as to keep the city _________.
A polluting          B. from polluting    C. pollute          D. from being polluted
D
考查動詞搭配。keep … from doing sth.阻止某人做某事，根據(jù)句意是阻止城市被污染，故用被動，選D。
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