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—Have you heard of Tu Youyou, the famous doctor who won Nobel Prize in 2015? —She devoted as much ti...
题目内容：
—Have you heard of Tu Youyou, the famous doctor who won Nobel Prize in 2015?
—She devoted as much time as she could ______ on the project artemisinin(青蒿素).
A. working B. to work C. worked D. to working
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