What were your younger brother doing, while you were listening to the music?
what was your brother doing when you were listening to the music
如果没学过过去式
what is your brother doing when you are listening to the music
What is you bother doing when you are listening to music？
You listen to music when your brother doing?
下面的这个比较准确
What were your brother doing when you was listening to music?
what was your brother doing when you were listening to the music
What was your brother doing when you were listening to music?
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