[题目]Tu Youyou is a Chinese scientist. She medicine since 1951.A.will studyB.has studiedC.studiesD.is studying 题目和参考答案——青夏教育精英家教网—

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【题目】Tu Youyou is a Chinese scientist. She medicine since 1951.
A.will study
B.has studied
C.studies
D.is studying

【答案】B
【解析】句意：屠呦呦是一名中国科学家。自1951年以来她一直研究药物。根据since 1951可知该用现在完成时，所以选B。

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