they are playing footboll at school.改为否定句 i'm doing my homework now.改为一般疑问句,做否定回答
the twins are singing in the room.对singing提问
人气：416 ℃ 时间：2019-08-21 23:41:24
解答
They aren't playing football at school.
Are you doing your homework now? No, I'm not.
What are the twins doing in the room?
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