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被动语态be made of/from — 英语选择题

译林版·英语(初中) Unit 4 Chinese folk art AI 三重审校通过

题目
制作蓝染布时,靛蓝叶经过加工后变成染料,成品中看不出叶片原来的样子。Which sentence is correct? A. The dye is made of indigo leaves. B. The dye is made from indigo leaves. C. The dye is made by indigo leaves. D. The dye is made in indigo leaves.