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    【题目】We must try our best ________ pollution ________again.

    A. to stop; happen

    B. to stop; from happening

    C. stopping; happening

    D. stopping; happen

    【答案】B

    【解析】句意：我必须尽最大努力阻止污染再次发生。try one’s best to do sth尽最大努力做某事，故第一空用动词不定式to stop。stop sb from doing sth阻止某人做某事，故用第二空用from happening，故选B。

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