◎ 题干
—Coach, can I continue with the training?    
—Sorry, you can't  ________ you haven't recovered from the knee injury.     
[     ]
A. until
B. before
C. as
D. unless
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—Coach, can I continue with the training?—Sorry, you can't________ you haven't recovered from the knee injury. [ ]A. until B. before C. as D. unless…”主要考查了你对  【从属连词】  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。