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【单选题】

It has been estimated that the earth's surface temperature has increased ______one quarter to three fourths of a degree since 1850.
A．by

B．at
C．to
D．with
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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

12%的考友选择了B选项

1%的考友选择了C选项

18%的考友选择了D选项

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