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A
since
B
before
C
after
D
when
正确答案 :B
解析
【翻译】科学家们称:这种药物能用在人身上之前可能还需要五六年。 [考点]词义辨析 【精析】Bsince:自从,因为,由于;before:在……之前;after:在……之后;when:当……时。根据句意可知,选B。
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