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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:句意:屠呦呦是一名中国科学家。自1951年以来她一直研究根据since 1951可知该用现在完成时,所以选B。

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