2. 外语
  3. Scientists say it may be five or six years _____ this medicine is tested on human beings.

Scientists say it may be five or six years _____ this medicine is tested on human beings.

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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
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