The astronaut is so tired that he has been asleep for eleven

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The astronaut is so tired that he has been asleep for eleven hours急,为什么用has been asleep

现在完成时态可以表示过去的动作一直到现在.那宇航员到现在一直睡了11小时.
我不知你提问的重点在哪.如果是时态的问题,这样解释就可以了.
现在完成时态的结构是：have done .文中的asleep是个形容词,不能直接用在have的后面.又要保持时态形式的完整性,所以就加上been.变成了have been asleep.如：
I have finished my homework.
I have been there twice.

The astronaut is so tired that he has been asleep for eleven the astronaut is so tired that he （ He was so tired that he f_____ asleep quickly.填空! he was so tired that he felt____(asleep) The worker is so tired that he .have a rest The worker is so tired that he .have a rest. He was so tired that he fell asleep halfway through reading. He was so tired that he fell asleep _____he went to bed A:as The fact that he has been dead is clear. I was so tired that () I closed my eyes,I fall asleep.A for He has been working for more than 5 hours．________ he is so he has been an english teacher for 20 years,so he is a(n) __