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初中英语语法:过去完成时基本结构由 had 加动词的过去分词构成。例句:She said she had never been to Paris. 她说她从未去过巴黎。When the police arrived, the thieves had run away. 警察到达时,小偷们早就跑了。By the time he was twelve, Edison had begun to make a living by himself. 到了十二岁那年,爱迪生开始自己谋生。