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【题目】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/stopfrom doing sth.都表示阻止做某事,其中keepfrom doing sth.中的from不能省略,动词后的宾语和from后的动名词是被动关系时,要用动名词的被动形式。

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