Had the shoes cost only twenty dollars less, she would have bought them. 에서 cost가 costed 되야하지 않나요? 가정법 과거완료이니까요 답지에 cost로 써있는데.. 알려주세용 ㅠ
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윗분 말대로 cost는 변화형태가 cost-cost-cost에여 ㅋㅋ costed는 없어요