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【单选题】

What may be the oldest fossil footprint yet found was discovered in June 1968 by William J. Meister, a non-professional fossil collector.
A．a part-time

B．a spare-time
C．an untrained
D．an amateur
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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

25%的考友选择了B选项

2%的考友选择了C选项

66%的考友选择了D选项

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