I'm sorry you've been waiting so long，but it'll still be some time ________ Brian gets back.
A．beforeB．sinceC．tillD．a(chǎn)fter
A

句意：對(duì)不起，讓你等了這么長時(shí)間，但是，Brian還要過一段時(shí)間才能回來。本題應(yīng)注意句型：It will be＋一段時(shí)間＋before從句，意為“要過多久才……”。
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