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    2．Facing a beggar，I may feel this poor person needs help，and the need will not be met _____ I put my hand in my pocket now．（　　）
    A．sinceB．in caseC．unlessD．while

    分析 面对一个乞丐，我会觉得这个可怜人需要帮助，而且这种需要不会得到满足，除非我现在就把手放到口袋里（掏钱）．

    解答 答案：C
    句意表达的是条件；since因为，in case以防万一，unless除非，while然而，却；unless相当于if not，和句中的the need will not be met构成双重否定，表达肯定的意思．故选C．

    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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