you didn`t hear my knocking at the door; you______ soundly w

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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）

you didn`t hear my knocking at the door; you______ soundly w 1.I am sure that you hear hem knocking at the door .2.What t I hear someone knocking at the door.的同义句 Listen!I hear someone knocking at the door. I tried to wake up my life by knocking at the door,but she w i seem to hear someone knocking at the door,knocking为什么要加ing ——at the door before you enter my room A knock B knocking Ck I didn't hear anyone knock at the door at 9:00 yesterday eve Don't come in before knocking at the door. I knocked at the door (l ) of times ,but he didn't hear it. Listen,l hear someone knocking at the door的同义句 Listen,l hear someone knocking at the door的同义句 Listen!There