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摘要: 过去分词的用法:1、过去分词概说过去分词在句中可以1) 构成谓语:a. 和have一道构成完成时态或非谓语动词的完成形式:I haven’t been out much recently.我最近没太出门。I knew you had been busy. 我知[阅读全文:]