I’m sorry you’ve been waiting so long but it’ll still be some time Brian get back.A. bef

问题补充：

I’m sorry you’ve been waiting so long, but it’ll still be some time Brian get back.

A. before

B. since

C. till

D. after

答案：

(答案→)A. before

B. since

C. till

D. after

解析：考查连词。It is some time before 是一个句型，表示“在之前就有一段时间了”。