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【单选题】

Which of the following records has been a source of information in the author's investigation
A.United States Immigration Service reports from 1914 to 1930.

B.Payrolls of southern manufacturing firms between 1910 and 1930.
C.The Volume of cotton exports between 1898 and 1910.
D.The federal census of 1910.
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根据网考网移动考试中心的统计,该试题:

0%的考友选择了A选项

6%的考友选择了B选项

39%的考友选择了C选项

55%的考友选择了D选项

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