---Wakeup，Peter．Timetorise.---I     asleepwhileIwasread...

問題詳情：

---Wake up，Peter．Time to rise.

---I      asleep while I was reading.

A．must fall                           B．could fall

C．should have fallen                  D．must have fallen

【回答】

D

知識點：情態動詞

題型：選擇題