问题
选择题
They have made medicine from a new plant _____a cure for fever.
A．used it as
B．using as
C．and used as
D．used as
答案
答案：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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