题目内容
12.Bad habits,_______ formed,are difficult,and sometimes impossible to shake off.( )A. | once | B. | before | C. | until | D. | unless |
分析 坏习惯一旦养成就很难,有时甚至是不可能改掉的.
解答 答案:A
题干中Bad habits are difficult,and sometimes impossible to shake off是一个简单句,中间插入了一个动词formed;formed形成,与bad habits之间构成被动关系,相当于bad habits are formed;要填连词,说明是一个省略句;句意表示的是条件;once一旦,before在之前,until直到,unless除非.故选A.
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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