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    【题目】Using traditional Chinese medical records, Youyou Tu rediscovered an ancient plant-based treatment for malaria that worked ________ modern therapies failed.

    A. until B. unless C. although D. where

    【答案】D

    【解析】

    试题分析：句意：根据中国传统的医学史料，屠呦呦再次发现了一种用古老的植物治疗疟疾的方法，现代医学(在此方面)都没有成功过。where在此处引导地点状语从句。故选D.

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