I_(listen)to music in my bedroom at that time ,so I __(not notice) anybody knocking at the door.

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I_(listen)to music in my bedroom at that time ,so I __(not notice) anybody knocking at the door.
I_(listen)to music in my bedroom at that time ,so I __(not notice) anybody knocking at the door.

I_(listen)to music in my bedroom at that time ,so I __(not notice) anybody knocking at the door.
was listening
didn't notice

那时我在卧室听音乐,所以没注意到有人敲门

was listening
didn't notice