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We all know some of the police’s duties are to keep order and ________ the law.

A. give out B. find out C. come out D. carry out

D 【解析】句意“我们都知道,一些警察的作用是维持秩序并执法”。A.发出;分发;B.查明;C.出版;D.执行。carry out the law执法。根据句意,故选D。
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