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

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

【答案】B

【解析】

試題分析：句意:這些清潔工為了保持城市清潔做出了很大貢獻。Make contribution to doing sth 為干某事做出貢獻。To是介詞，后面接doing。故選B。

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