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Scientists say it may be five or six years _____ this medicine is tested on huma
Scientists say it may be five or six years _____ this medicine is tested on huma
游客
2025-02-28
7
管理
问题
Scientists say it may be five or six years _____ this medicine is tested on human beings.
选项
A、since
B、before
C、after
D、when
答案
B
解析
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