ThismedicinediscoveredbyTuYouyou

来源：语文精选馆 2.23W

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

【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。