It is a long time they separated, but it won’t be long they meet again.
A. since; before
B. after; when
C. since; when
D. after; before
网友回答
(答案→)A. since; before
B. after; when
C. since; when
D. after; before
解析：考查连词，句意：自从他们分开很长一段时间了，但是不久他们就会在见面的。这是两个固定句型。It is + 时间段+ since+ 一般过去式，自从什么有一段时间了，it won’t be long before 不久就，所以选A。