题目内容

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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