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20.-My son is addicted to drugs.He isn't hopeless,is he?
-Yes,     he mends his ways and starts all over.(  )
A.ifB.whenC.even ifD.unless

分析 -我的儿子沉迷毒品.他还有希望,对吗?-不,除非他痛改前非,重新做人.

解答 答案:D 句中反意疑问句陈述句部分用否定,回答中的yes要翻译为不,意思是他没希望了;后面表达的是肯定的意思,与前面的回答构成转折含义;unless相当于if not,符合句意.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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