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【单选题】

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

A、since
B． before
C．after
D．when
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根据网考网移动考试中心的统计，该试题：

15%的考友选择了A选项

77%的考友选择了B选项

4%的考友选择了C选项

4%的考友选择了D选项

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