—The current European debt crisis is affecting many countries in the world.—Will it be at

问题补充：

—The current European debt crisis is affecting many countries in the world.

—Will it be at least several years everything returns to normal?

A. when

B. before

C. that

D. since

答案：

A. when

(答案→)B. before

C. that

D. since

解析：考察固定句型。It be 一段时间before…一段时间以后才做某事；结合句意可知B正确。句意：至少几年以后一切都恢复正常。