问题
Everyone here will thank the firefighter forthe things they have done to prevent fires______the environment safer.
A:giving responses to the moods of the owners
B:giving proposals like assistants or companions
C:offering advice to their owners’ friends or relatives
D:from making
B:giving proposals like assistants or companions
C:offering advice to their owners’ friends or relatives
D:from making
正确答案是：
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