问题
单项选择题
When Lily came home at 5p.m. yesterday, her mother（） dinner in the kitchen.
A.cooked
B.was cooking
C.cooks
D.had cooked
答案
参考答案：B
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When Lily came home at 5p.m. yesterday, her mother（） dinner in the kitchen.
A.cooked
B.was cooking
C.cooks
D.had cooked
参考答案：B