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11.It must have been something serious,____ they wouldn't have radioed for help.(  )
A.or elseB.in caseC.in thatD.or rather

分析 一定是出了什么严重的事情,否则他们不会发无线电求救.

解答 答案:A 题干中they wouldn't have radioed for help是虚拟结构,表示与事实相反的假设,说明前面应该是一个隐含条件;or else否则,in case以防万一,in that因为,or rather更确切的说.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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