By the time the fire-fighters arrived the fire had been put＿＿＿by the teachers and the st

问题补充：

By the time the fire-fighters arrived, the fire had been put＿＿＿by the teachers and the students.

A. down

B. away

C. out

D. off

答案：

A. down

B. away

(答案→)C. out

D. off

解析：put out意为“扑灭（火）”。