I ____ while reading the English textbook. Luckily, my roommate woke me up in time!
| A．was falling asleep | B．have fallen asleep |
| C．fell asleep | D．had fallen asleep |
I ____ while reading the English textbook. Luckily, my roommate woke me up in time!
| A．was falling asleep | B．have fallen asleep |
| C．fell asleep | D．had fallen asleep |
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