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

句意:对不起,让你等了这么长时间,但是,Brian还要过一段时间才能回来。本题应注意句型:It will be+一段时间+before从句,意为“要过多久才……”。
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