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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