The fire before the fire-fighters arrived．
A. has been put out
B. was put out
C. had put out
D. had been put out
网友回答
A. has been put out
B. was put out
C. had put out
(答案→)D. had been put out
解析：考查时态。根据the fire-fighters arrived用一般过去时，故大火扑灭是过去的过去，即过去完成时，用其被动形式。句意：消防员到达之前，大火已经被扑灭了。