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  They have made medicine from a new plant _____a cure for fever.
A.used it asB.using asC.and used asD.used as
D
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。
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