I was listening to the music ______ there was a knock at the door.

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问题 I was listening to the music ______ there was a knock at the door.

选项 A、when
B、while
C、because

答案A

解析 本句意为“当敲门声响起的时候,我正在听音乐”,是时间状语从句。while的用法是“当…正在发生的时候,某人(某物)在做什么”。because引导原因状语从句,不符题意。
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