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9.The bell rang ______ the teacher was explaining the problem to the students..(  )
A.afterB.whileC.before

分析 当老师在向同学们解释难题的时候,铃声响了.

解答 答案:B;
根据设空处的句子用了过去进行时,可以推断本句的句意是"当老师在向同学们解释难题的时候,铃声响了.",表示主句的动作发生在在从句动作持续进行的过程中,所以用while引导该时间状语从句,while"当…时",通常与延续性动词连用,且用于进行时中,故选B.

点评 本题主要考查连词的用法,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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