问题补充：
As she the newspaper, Granny asleep.
A. read, was falling
B. was reading, fell
C. was reading, was falling
D. read, fell
答案：
A. read, was falling
(答案→)B. was reading, fell
C. was reading, was falling
D. read, fell
解析：句意：当奶奶正在读报纸的时候，她睡着了。as表示两个动词同时进行，有“一边，一边”的含义，fall asleep入睡，表示一种状态，睡着了，无需用进行时态形式，故选B
