I was listening to the music______there was a knock at the door.A、whenB、whileC

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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 while引导的从句常用进行时态，此为主语进行时态。

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Iwaslisteningtothemusic______therewasaknockatthedoor.A、whenB、whileC