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Using traditional Chinese medical record...

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

 

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. 考点:考查状语从句  
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