Everyone here will thank the firefighter for the things they have done to prevent fires the environment safer.
A. make
B. to making
C. to make
D. from making
网友回答
A. make
B. to making
(答案→)C. to make
D. from making
解析：考察非谓语动词，根据句意可知该处作目的状语，
意为，这里的每个人都将要感谢 消防员，因为他们做了很多事情来阻止大火，为了让周围的环境安全。