I'm sorry you've been waiting so long, but it'll still be some time Sundance gets back.
A. until
B. before
C. after
D. since
网友回答
A. until
(答案→)B. before
C. after
D. since
解析：本题考查状语从句的用法。句意为:对不起让你久等了，但是还得再过一段时间Sundance才回来。故空格处须用before表示“在……之前，直到……才……”。