题目内容

Everyone here will thank the firefighters for the things they did to prevent fires ________the environment safer.
A．to make B．makeC．makingD．from making
A

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。
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