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    18．_____time goes by，the computer will become smaller and smaller．（　　）
    A．WhenB．WithC．AsD．While

    分析 随着时间的流逝，电脑会变得越来越小．

    解答 答案：C．根据the computer will become smaller and smaller可知time goes by表示随着时间的流逝，选项中with 的复合结构（with+n．+非谓语动词）和as引导的状语从句都可以表示"随着"的含义，因为time goes by是个句子，所以答案是C．其他两个选项的含义分别是A"当…时候"；D"当…时候，然而"．

    点评 考查从属连词．as用作连词引导时间状语从句
    　　as与when，while都是引导时间状语从句的从属连词，含义都是"当…的时候"．但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义．例如：
    　　（1）It was snowing when he arrived at the construction site．他到达工地时，天正在下雪．

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