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【单选题】

Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.

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

0%的考友选择了A选项

18%的考友选择了B选项

77%的考友选择了C选项

5%的考友选择了D选项

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