◎ 题干
I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.
A.sinceB.beforeC.tillD.after
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.A.sinceB.beforeC.tillD.after…”主要考查了你对  【therebe句型】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。