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8.My mother       dinner when I got home yesterday.(  )
A.has cookedB.was cookingC.will cookD.cooks

分析 昨天当我到家的时候我的妈妈在做晚餐.

解答 答案:B 
根据 when引导的一般过去时的时间状语从句推断主句描述的是过去某个时间正在发生的动作,故用过去进行时态,它的构成为:主语+was/were+V-ing形式,主语是第三人称单数形式,be动词应该用was.故选B

点评 本题考查了动词的时态问题.做题时,注意观察句子中是否有能判断句子时态的标志性的单词.

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