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20.
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
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
参考答案
