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    6．_____ makes the working class differ from peasants is longer periods of employment and more fixed incomes．（　　）
    A．ThatB．HowC．WhatD．Whether

    分析 使工人阶级不同于农民的是一个较长的就业时期和更灵活的收入．

    解答 答案：C．
    根据is longer periods of employment and more fixed incomes说明前面整句是主语从句，而主语从句  makes the working class differ from peasants可知句子不完整，缺主语什么，what，故选C．

    点评 本题考查主语从句的连接词，在充分分析句型基础上便能选出正确答案．

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