,was sleeping我那时正在睡觉.用,was sleeping是这个意思如果你用have slept 那不就睡到现在了么.一个动作持续到现在何况.when是有5个基本句型的be doing +when 就是其中一个还有on the point of doing +whenhad...谢谢了！非常感谢！...没事，干嘛追问呢？who was late for class again？---you ask？Tim，of course。A can B would c need d could这题。。。能写正确吗？有点迷茫。。。