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12.Before space travel,an astronaut must know        it might feel like to stay in an imaginary environment.(  )
A.whenB.whatC.howD.that

分析 天空旅行之前,宇航员必须知道这一个虚幻的环境里感觉会是什么样的.

解答 答案:B
题干中it might feel like to stay in an imaginary environment是作动词know的宾语,是一个宾语从句;从句中feel like缺少宾语,要用连接代词.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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