【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：句意：屠呦呦是一名中國(guó)科學(xué)家。自1951年以來(lái)她一直研究藥物。根據(jù)since 1951可知該用現(xiàn)在完成時(shí)，所以選B。

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