楼上有误区,这句话的意思就是：这么晚了(还不睡),你在做什么?
up this late一起是时间状语,单说up做什么成分的话,up意思上相当于till,语法成分上讲,这里是限定时间范围,表示动作一直延续到所表示的时间（this late）
what are you doing up this late 这里的up做什么成分 修饰谁
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