2010届高三英语一轮复习必备精品同步练习：Module5 Unit5 First Aid_高考复习指南

　　A. which

　　B. that

　　C. what

　　D. whether

　　（答案：B no doubt后为同位语从句，that作为引导词，不充当句子成分）

　　4．John was studying in his room when he heard screaming.

　　【句型剖析】此句型中when作并列连词相当于and then意为”正当……时突然”

　　【归纳拓展】when并列连词，= and then，表示“就在那时，突然”，常见以下句型中：

　　(1) be doing...when...正在做……突然……I was wandering through the streets when l caught sight of a tailor's shop.

　　(2) had done...when...刚做了……突然……I had just sat down when the light went out.

　　(3) be about to do...when...刚要做……突然……I was just about to go swimming when our guide saw me and shouted at me.

　　该句中的“when”表示“正在这时”，相当于and just或and at that time. 这时不能用while / as 替换。

　　常见句型：(1) be about to do sth when... (2) be doing sth when... (3) be on the point of doing sth when...

　　【高考链接】We were swimming in the lake ____ suddenly the storm started. (2004北京春招)

　　A. when

　　B. while

　　C. until

　　D. before

　　答案A "when" 作连词，表示“正在这时”。意为“我正在湖中游泳，突然暴风雨来了。”只有when才能用于这种句型A. why

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