I’m sorry to tell you it is nearly five months smith got injured in the leg but I think

问题补充：

I’m sorry to tell you it is nearly five months smith got injured in the leg, but I think it won’t be long he completely recovers.

A. after; when

B. before; since

C. that; when

D. since; before

答案：

A. after; when

B. before; since

C. that; when

(答案→)D. since; before

解析：考查固定句型。It is +一段时间+since 从句 （一般过去时） It won’t be long before +从句 （一般现在时）故答案为D。