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【题目】Mr Lee devoted all his free time he had to________ (改善) the environment around him.

【答案】improving

【解析】

句意:李先生把他的一生都投入到改善他周围的环境上去了。

根据文中“devote to doing sth.”致力于做某事,该短语中的to是介词,后面跟动词的ing形式,所以用improveing形式。故填improving

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