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Everyone here will thank the firefighters for the things they did to prevent fires ________the environment safer.

A.to make B.make C.making D.from making

A

解析试题分析:句意:这里的每一个人都感谢消防员为了环境的安全,阻止火灾所做的一切事情。用不定式作状语,表目的,选A。
考点:考查不定式的用法

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