【开放英语4(英语II(2))-1162网上形考机考题库】 When Lily came home at 5p.m. yesterday, her mother dinner in the kitchen.

【开放英语4(英语II(2))-1162网上形考机考题库】 When Lily came home at 5p.m. yesterday, her mother dinner in the kitchen.
A. cooked
B. was cooking
C. cooks
D. has cooked