people will thank the firefighters for the things they do to stop fires____the environment safer.

问题描述:

people will thank the firefighters for the things they do to stop fires____the environment safer.
A make B to make C from making D making 分析下句子划分下成分谢谢

选B
人们将要感谢消防员为了灭火来保证环境安全所做的事.
句子主干是people will thank the firefighters for the things
things后面是shenglve了关系代词的定语从句,还原一下就是
they do things (to stop fire)( to make the environment safer.)
其中两个括号里的是两个目的状语,做事是为了救火,救火是为了保证环境更安全.
本题容易错选为C,不是防止环境安全