【单选题】
In 1863 the United States government began providing which of the following to mail carriers
A.Housing.
B.A salary.
C.Transportation.
D.Free postage stamps.
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根据网考网移动考试中心的统计,该试题:
37%的考友选择了A选项
58%的考友选择了B选项
4%的考友选择了C选项
1%的考友选择了D选项