2. 外语
  3. I was listening to the music______there was a knock at the door.

I was listening to the music______there was a knock at the door.

admin2012-07-18  29
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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