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【单选题】

The speculation,______ by some suggestive evidence, came from an American scientist.
A．summed up

B．backed up
C．added up
D．put up
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根据网考网移动考试中心的统计，该试题：

42%的考友选择了A选项

54%的考友选择了B选项

0%的考友选择了C选项

4%的考友选择了D选项

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