When Lily came home at 5 p.m. yesterday, her mother _____dinner in the kitchen.A

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问题 When Lily came home at 5 p.m. yesterday, her mother _____dinner in the kitchen.

选项 A cooked
B was cooking
C cooks
D has cooked

答案B

解析考点:动词时态。when引导的时间状语从句与主句的动作同时发生。如果从句谓语用过去时,主句谓语动词就用过去进行时。句意:Lily昨天下午五点回家时,妈妈正在厨房里做晚饭。
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