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17.If you want to do the experiment again,you'd better be more careful         you made a mistake.(  )
A.whenB.whyC.whereD.that

分析 如果你想再做一次实验,那么你最好在你犯错误的地方更加小心.

解答 答案:C 
题干中you made a mistake位于形容词careful后,是一个状语从句;句中again表示再一次,说明前面的实验中犯了错误,那么这一次要做上次犯错误的地方多加小心,是一个地点状语从句.故选C.

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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