问题补充:
Im sorry youve been waiting so long, but itll still be some time Sundance gets back.
A. until
B. before
C. after
D. since
答案:
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……”。