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Child when playing, you must stare at all the time he
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You should look after the child all the time while he is playing.
When child playing, you must stare at all the time he
You should look after him every minute when he is playing.
When the children are playing ,you must look after them every minute. 楼上那个是不是错的有点过火啦，前面用单数的child后面有复数的them ，还有我记得every minute.前面不加at的吧
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