.the manager had fallen asleep where he ______,without undressing .这道题选B,为什么用这样的时态呢?这有什么样的知识点呢?A.was laying，B. was lying ．C. had laid D. had lied

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.the manager had fallen asleep where he ______,without undressing .
这道题选B,为什么用这样的时态呢?这有什么样的知识点呢?
A.was laying，B. was lying ．C. had laid D. had lied