◎ 题干
--- When did your father come back last night?
--- He didn’t come back _______ he finished all the work.                                                           
A.until B.while C.if D.unless
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“--- When did your father come back last night?--- He didn’t come back _______ he finished all the work.A.untilB.whileC.ifD.unless…”主要考查了你对  【并列连词】【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。