【題目】Something must be done to prevent factories ________ poisonous gases so as to keep the city ________.

sending out; from polluting

send out; polluting

from sending out; from polluting

sending out; being polluted

【答案】D

【解析】keep/prevent/stop…from doing sth.都表示“阻止做某事”，其中keep…from doing sth.中的from不能省略，動詞后的賓語和from后的動名詞是被動關(guān)系時，要用動名詞的被動形式。

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