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Scientists say it may be five or six years______this medicine is tested on human
Scientists say it may be five or six years______this medicine is tested on human
游客
2025-03-11
19
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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
考察时间状语的连接词,根据题意是说“科学家们说大概要等5到6年,这种药才会在人类身上试验。”before引导时间状语从句,表示“在…之前”。
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