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

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