书名：命题老师最爱考的英文文法
版本：
页数：p.287 EXERCISE 01
题目：
While eating her breakfast, Maria called her friends.
将省略的副词子句还原
疑问：这题还原完的答案是：
While she was eating her breakfast, Maria called her friends.
我很好奇不能还原成这样吗：
While she ate her breakfast, Maria called her friends.
不知道这问题会不会太简单，但是小弟想了很久想不通，所以上来发问，
希望有高手可以帮忙回答，谢谢。