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    精英家教网 > 高中英语 > 题目详情
    12．We are planning to go camping ________ it doesn't rain tomorrow．（　　）
    A．thoughB．ifC．unlessD．while

    分析 如果明天不下雨我们打算去露营．

    解答 答案：B
    though尽管；if如果；unless除非；while当…时候；句意表达的是条件，且从句是否定，要用if来连接，unless表达否定，相当于if not，故选B．

    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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