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9.---Did you participate in his celebration party yesterday?
---No,I _____ my mother do housework all day.(  )
A.would helpB.helpedC.had helpedD.was helping

分析 --你昨天参加了他的庆祝会了吗?
--没有,我整天都在帮助妈妈做家务.

解答 答案选择D.本题考查过去进行时;过去进行时表示过去某一点时间或过去某一段时间内正在进行的动作;这里的all day是指昨天一整天,所以help这个动作是过去的一段时间正在做…,用过去进行时,所以选D.

点评 对时态的选择,要在把握时态的基本用法的基础上,根据具体语境和题干中的时间推断时态,同时关注特殊的结构.

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