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I was doing my homework _______ mother was cooking.
A.when B.whileC.asD.what time
B

试题分析:when当……时;while当……时,一边……一边……;as   因为,随着;what time什么时间。句意:当我的母亲正在做饭时,我正在做作业。While引导时间状语从句强调主从动作的同时发生,结合语境可知选B。
点评:连词在句子中主要起联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多,语义之间还有交叉,熟记其基本应用规则,了解其区别,注意固定搭配对象,是做好此类题型的关键。
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