—The firemen tried their best to ______ the fire but in vain.A. put up B. put fo

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问题 —The firemen tried their best to ______ the fire but in vain.

选项 A. put up
B. put forward
C. put down
D. put out

答案D

解析消防队员们尽力扑灭火灾却徒劳无功。
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