题目内容
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
【答案】
D
【解析】 略
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题目内容
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
【解析】 略