Tu Youyou is a Chinese scientist. She me...

Tu Youyou is a Chinese scientist. She medicine since 1951.

A．will study B．has studied

C．studies D．is studying

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。考点：现在完成时

考点分析：

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