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ThismedicinediscoveredbyTuYouyou

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問題詳情：

ThismedicinediscoveredbyTuYouyou

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，故爲has saved，故選C。

知識點：動詞時態

題型：選擇題

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