I while reading the English textbook. Luckily my roommate woke me up in time !A. had fal

问题补充：

I while reading the English textbook. Luckily, my roommate woke me up in time !

A. had fallen asleep

B. have fallen asleep

C. fell asleep

D. fall asleep

答案：

A. had fallen asleep

B. have fallen asleep

(答案→)C. fell asleep

D. fall asleep

解析：根据woke(wake 的过去式)可以判断，这里谈论的与“现在”无关，因此可以排除B和D两项。I是在读书期间睡着的（while reading）,而不是在之前睡着的，所以A项也是不恰当的。