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最佳答案:study-studied-studied
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最佳答案:feel,felt,felt. rise,rose,risen.
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最佳答案:watch ,watched,watchedam was,beencry,cried,criedtravel ,travelled,travelledplan,
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最佳答案:原形,过去式,过去分词play,played,playedstudy,studied,studiedrain ,rained ,rainedfly ,flew