题目内容
20.-Are you going to stay overnight?-No,___________it's really necessary.( )
A. | if | B. | unless | C. | until | D. | since |
分析 -你打算一晚上都不睡吗?-不,除非有必要.
解答 答案:B 题干是否定回答,意思是我不打算熬夜;if如果,unless除非,until直到,since因为;句意表达的是条件,如果不是非熬夜不可,不然我不会熬夜.故选B.
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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