I’m sorry you’ve been waiting so long, but it’ll still be some time Brian gets.back.
A. before
B. since
C. till
D. after
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(答案→)A. before
B. since
C. till
D. after
解析:根据句意,只有填before时意思最通顺。It’ll be some time before…是英语中一个很有用的句式,其意为“要过一段时间才……”,如:It’ll be some time before we meet again. 要过一段时间我们才能见面。有时也可用其他时态,如:It was some time before we struck the track. 我们用了很长时间才找到了路。