the manufacture of automobiles was extremely expensive until assembly-line techniques made them cheaper to produce. 구문에서 until을 시간조건부사절로 봐서 made 를 make 로 바꿀수없는거야?
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the manufacture of automobiles was extremely expensive until assembly-line techniques made them cheaper to produce. 구문에서 until을 시간조건부사절로 봐서 made 를 make 로 바꿀수없는거야?
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