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This medicine discovered by Tu Youyou __...

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

 

C 【解析】句意:屠呦呦发现的这种药自从投入使用以来,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。  
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