---It is a long time I saw you last-Yes．And it will be a long time we see each other

问题补充：

---It is a long time I saw you last．

---Yes．And it will be a long time we see each other again．

A. when; before

B. after; when

C. since; before

D. since; until

答案：

A. when; before

B. after; when

(答案→)C. since; before

D. since; until

解析：

试题分析:考查状语从句。固定句型“it is /has been +时间段+since从句”意思是“自从。。。以来有多久了”；而“it will be +时间段+before从句” 意思是“还要多长时间才能。。。”，所以C选项正确。句意：---自从上次见到你有很长时间了。---是的。并且到我们下次再见面还得要很长时间。