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    12．---How long did you wait？
    ---__________ they came back at 10．（　　）
    A．UntilB．BeforeC．AfterD．When

    分析 -你等了多久？
    -一直等到他们十点回来．

    解答 答案：A
    题干中how long是对时间段提问；until直到，before之前，after之后，when当…时候；句意表达的是动作的持续，until后接时间状语，前面省略了I waited，即I waited until they came back at 10；表示持续动作的持续时间，要用until来连接．故选A．

    点评 从属连词是连词的一种，用来引导名词性从句和状语从句．大致可分为三大类：that（无词义，不做成分）if，whether （表达是否的意义，但不做句子成分）； 连接代词：who，whom，whose，what，which，whatever，whoever，whichever（有词义，在句子中可作主语、表语、宾语）；连接副词：when，where，why，how，how many，how long，how far，however，whenever，wherever （有词义，作从句的状语）．学习时，要注意区分和掌握．

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