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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】试题分析:考查动词时态。句意:屠呦呦是一个中国籍的科学家。自从1951年,她就研究医药了。

由于本句中出现时间状语since 1951,故用现在完成时。根据句意,故选B

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