题目内容
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． | How | B． | Because | C． | If | D． | 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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