Everyone here will thank the firefighter for the things they have done to prevent fires______the environment safer.
A．makeB．to makingC．to makeD．from making
C
考察非謂語動詞，根據(jù)句意可知該處作目的狀語，
意為，這里的每個人都將要感謝 消防員，因為他們做了很多事情來阻止大火，為了讓周圍的環(huán)境安全。
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