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【单选题】

Scientists say it may be ten years ______ this medicine was put to use.
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:

69%的考友选择了A选项

14%的考友选择了B选项

14%的考友选择了C选项

3%的考友选择了D选项

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