you didn`t hear my knocking at the door; you______ soundly when i came in答案是must be sleeping 是否应是must have been sleeping

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youdidn`thearmyknockingatthedoor;you______soundlywhenicamein答案是mustbesleeping是否应是musthavebeensleepin

you didn`t hear my knocking at the door; you______ soundly when i came in答案是must be sleeping 是否应是must have been sleeping
you didn`t hear my knocking at the door; you______ soundly when i came in
答案是must be sleeping 是否应是must have been sleeping

you didn`t hear my knocking at the door; you______ soundly when i came in答案是must be sleeping 是否应是must have been sleeping
答案是对的.
若用must have been sleeping则表示从过去某个时间点一直睡到现在；
而依题意应该仅是‘我’在敲门时,你睡得很香甜.
FYI:
现在完成进行时表示从过去某时开始一直持续到现在的动作,并且还将持续下去.
The Chinese have been making paper for two thousand years.
中国有2000年的造纸历史.（动作还将继续下去）
I have been learning English since three years ago.
自从三年前以来我一直在学英语.（动作还将继续下去）

must be sleeping 是对的，表示当时的状态。

选后者表示对过去某事的猜测前面有didn't,所以看出是过去时

you didn`t hear my knocking at the door; you___must have been sleeping___ soundly when i came in.
因为已经睡着了所以听不到。
呵呵

应该是 must be sleeping
因为问的是当我进来的时候，你一定是在睡的死死的－－注意到这里睡发生的时间是我进来的那一刻，所以不用完成时态

must be sleeping说明当时的一种状态,用进行时,本来应是you were sleeping soundly,因must后必须跟原形,所以用be sleeping. have been sleeping现在完成进行时态,用于表示过去一直到现在一段时间持续进行的一种动作,此处没这个意思

must be sleeping

must have been sleeping

那个答案是意思是指猜测，
你没有听见我敲门的声音，你肯定在睡觉

嗯，我觉得应该是must have been sleeping.
must在这里表“推测”。
当表示现在对已发生过的事情的推测，一般用must have done结构，意思是“想必是……（过去）一定是”。这个很符合题意。
must be doing(=must being)这个结构是表示对现在某个动作或即将发生的事情的推测，意思是“一定，准是”。因为如题它前句用的是过去时，...

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