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

分析 隨著時間的流逝，電腦會變得越來越�。�

解答 答案：C．根據(jù)the computer will become smaller and smaller可知time goes by表示隨著時間的流逝，選項中with 的復(fù)合結(jié)構(gòu)（with+n．+非謂語動詞）和as引導(dǎo)的狀語從句都可以表示"隨著"的含義，因為time goes by是個句子，所以答案是C．其他兩個選項的含義分別是A"當(dāng)…時候"；D"當(dāng)…時候，然而"．

點評 考查從屬連詞．a(chǎn)s用作連詞引導(dǎo)時間狀語從句
　　as與when，while都是引導(dǎo)時間狀語從句的從屬連詞，含義都是"當(dāng)…的時候"．但它們有區(qū)別：用when時，從句的動作可以與主句的動作同時發(fā)生，也可以先于主句的動作發(fā)生；用while時，從句的動作為一過程，主句動作與從句動作同時進(jìn)行或在從句動作過程中發(fā)生；用as時，主句和從句的動作同時發(fā)生，具有延續(xù)的含義．例如：
　�。�1）It was snowing when he arrived at the construction site．他到達(dá)工地時，天正在下雪．

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