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【单选题】

A、Scientists thought there wasn’t.

B.Scientists hadn’t got an answer.

C.Scientists were uncertain.

D.Scientists were still studying.

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根据网考网移动考试中心的统计,该试题:

66%的考友选择了A选项

12%的考友选择了B选项

8%的考友选择了C选项

14%的考友选择了D选项

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