单项选择题
When Lily came home at 5 p.m. yesterday, her mother（）dinner in the kitchen.
A.cooked B.was cooking C.cooks D.has cooked
单项选择题 When I was a child, I enjoyed（）picturebooks.
单项选择题 When I got home, my little brother was（）
单项选择题 When father was young, he（）from morning till night.
