They have made medicine from a new plant a cure for fever.A. used it asB. using asC. and u

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A. used it as
B. using as
C. and used as
(答案→)D. used as
解析：考查过去分词做定语，medicine和use是被动关系，用过去分词做定语，句意：我们从一种新的植物中研发了一种治疗感冒的药物。选D。