【題目】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

【答案】C

【解析】句意：屠呦呦發(fā)現(xiàn)的這種藥自從投入使用以來，已經(jīng)挽救了許多人的生命。since引導的時間狀語從句用一般現(xiàn)在時，故為has saved，故選C。

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