【題目】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】

試題分析：句意：根據(jù)中國傳統(tǒng)的醫(yī)學史料，屠呦呦再次發(fā)現(xiàn)了一種用古老的植物治療瘧疾的方法，現(xiàn)代醫(yī)學(在此方面)都沒有成功過。where在此處引導地點狀語從句。故選D.

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