what are you doing
i am singing an english song
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1.were doing was singing
2.did do sang
3.are doing singing
根据语境还有很多种答案……
What are you doing?
I am singing an English song.
What are you doing？
I am singing an English song
现在进行时
are doing
am singing
根据空来填。
What did you do?I sang an English song
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