Question

【题目】 People will thank the firefighters for the things they do to prevent fires ________ the environment safer.

A. make B. to make

C. from making D. making

Answer 1

【答案】B

【解析】to make the environment safer 是 prevent fires 的目的，因此用不定式。句意，人们由于消防队资为了防火而使得环境更安全所做的事情而感谢他们。