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【单选题】

Scientists say that many factors ______ great changes in the weather.
A．brought about

B．brought on
C．brought up
D．brought forward
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根据网考网移动考试中心的统计，该试题：

54%的考友选择了A选项

12%的考友选择了B选项

9%的考友选择了C选项

25%的考友选择了D选项

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