ThismedicinediscoveredbyTuYouyou
問題詳情:
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:屠呦呦發現的這種*自從投入使用以來,已經挽救了許多人的生命。since引導的時間狀語從句用一般現在時,故為has saved,故選C。
知識點:動詞時態
題型:選擇題
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