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
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(答案→)A. since, before
B. after, when
C. since, when
D. after, before
解析：考查连词用法。since“从那时起到现在”；before“在……之前”；after“在……之后”；when“当……时候”。这题考查的是固定句型：It is a long time sine…表示自从.. 已经很久了。It will be long before…表示“很久以后将…”，句意：自他们分开以来, 有好长一段时间了。但是, 不久他们就会再见面的。由此可知, A正确