【題目】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】試題分析：考查動詞時態(tài)。句意：屠呦呦是一個中國籍的科學(xué)家。自從1951年，她就研究醫(yī)藥了。

由于本句中出現(xiàn)時間狀語since 1951，故用現(xiàn)在完成時。根據(jù)句意，故選B。

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