ThismedicinediscoveredbyTuYouyou
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问题详情:
This medicine discovered by Tu Youyou ________ many people’s lives since it was put into use.
A. is saving B. will save C. has saved D. had saved
【回答】
C
【解析】句意:屠呦呦发现的这种*自从投入使用以来,已经挽救了许多人的生命。since引导的时间状语从句用一般现在时,故为has saved,故选C。
知识点:动词时态
题型:选择题
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