He has been______(sleep)for two hours since he went to bed.请说明理由

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He has been______(sleep)for two hours since he went to bed.请说明理由
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He has been______(sleep)for two hours since he went to bed.请说明理由
He has been______(sleep)for two hours since he went to bed.
请说明理由

He has been______(sleep)for two hours since he went to bed.请说明理由
sleeping
have/ has been doing 现在完成进行时 结构
不明白的再问哟,请及时采纳,多谢!

He has been__sleeping____(sleep)for two hours since he went to bed.
have/ has been doing 现在完成进行时结构,表示从到床上一直睡到现在,并且在说话的时刻,仍然处于睡觉状态。
祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢!