问题
选择题
I _____ while watching the movie 2012 last night. Unluckily, my roommate woke me up.
A．had fallen asleep
B．have fallen asleep
C．fell asleep
D．fall asleep
答案
答案：C
考查时态.根据时间状语last night可知描述的是过去发生的动作,故用过去时态,选C.
