题目内容

【题目】The cleaners make a great contribution to _____ the city clean.

A.kept B.keeping C.keep D.be kept

【答案】B

【解析】

试题分析：句意:这些清洁工为了保持城市清洁做出了很大贡献。Make contribution to doing sth 为干某事做出贡献。To是介词，后面接doing。故选B。

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