— How long do you think it will be the USA recovers from the losses of the financial crisis?
— Perhaps four or five years.
A. when
B. since
C. that
D. before
网友回答
A. when
B. since
C. that
(答案→)D. before
解析：此题考查固定句型：It+ will be +时间段+ before +其它 意为多久才……。句意为你认为多久美国才能从经济危机的损失中恢复过来呢？ 也许四年或五年。所以选D。