题目内容

20．I was about to greet him         I realized that I couldn't tell his name．（　　）
A．sinceB．whenC．asD．while

分析 我正准备迎接他，就在那时我发现自己叫不出他的名字．

解答 答案：B 句型搭配，be about to do sth when加从句，表示正准备做某事，就在那时…；since从…开始，as一边…一边…，while然而；when除了表示当…时候，还有at that time正在那时的含义．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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