【題目】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：我必須盡最大努力阻止污染再次發(fā)生。try one’s best to do sth盡最大努力做某事，故第一空用動詞不定式to stop。stop sb from doing sth阻止某人做某事，故用第二空用from happening，故選B。

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