问题描述：
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 选什么
a.had fallen asleep b.have fallen asleep c.fell asleep d.fall asleep 选什么
问题解答：
我来补答展开全文阅读