--- It’s a long time I saw you last.
-----Yes, and what a pity it is now that it will be a long time we see each other again.
A. since; when
B. before; since
C. when; before
D. since; before
网友回答
A. since; when
B. before; since
C. when; before
(答案→)D. since; before
解析：考查固定句型。第一空根据时态及句意可知应该用since.第二空的句型：it be 一段试卷before从句；意为：一段时间以后某事才发生。句意：—自从上次看见你到现在有很长时间了!—是的，如此长时间以后我们才能再一次见面真是一件遗憾的事情。