【題目】 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

【答案】B

【解析】to make the environment safer 是 prevent fires 的目的，因此用不定式。句意，人們由于消防隊資為了防火而使得環(huán)境更安全所做的事情而感謝他們。

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