问题
选择题
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
答案
答案：D
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。