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7.___the whole process for the studies of cancer took more than a year,the technology is moving so fast that it will soon take just weeks.(  )
A.HowB.BecauseC.IfD.While

分析 虽然研究癌症的整个过程已经耗时一年多,但是技术发展如此之快以至于很快就用不了几周的时间就有进展了.

解答 答案:D
句意表达的是转折;How 怎样,引导方式状语从句;Because因为,引导原因状语从句;If如果,引导条件状语从句;While 当…时候,尽管,引导让步状语从句.根据句意,故选D.

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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