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    6．Don't put off till tomorrow _______ you should do today!（　　）
    A．whatB．whenC．thatD．which

    分析 不要把今天应该做的事情推到明天．

    解答 答案：A
    题干中you should do today是作put off的宾语，是一个宾语从句；宾语从句中do缺少宾语，要用连接代词；which在宾语从句中表示有范围的选择，句意表达的是不具体的事情，不是表示选择．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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