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    12．It is easy to set the goal of our production for next year，but      to achieve it takes a lot of trouble．（　　）
    A．howB．whoC．whereD．when

    分析 为我们明年的产品确立一个目标很容易，但如何实现目标却不轻松．

    解答 答案：A 句中to achieve it是作句子的主语；how表示方式，who指代人，where表示地点，when表示时间；句意表达的是和set the goal确立目标，相对应的实现目标，应该是实现目标的方法．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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