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最佳答案:noticedfollowedopenedhurried
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最佳答案:uy bought boughtdo did donehave had hadsee saw seenopen opened opened
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最佳答案:open--opened--opened
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最佳答案:原形,过去式,过去分词be、was / were ,beensee、saw ,seenair、aired ,airedclean、cleaned ,cleane