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【单选题】

The authorities spend a lot of money ______ keeping the streets and parks clean.
A.in

B.on
C.up
D.out
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根据网考网移动考试中心的统计,该试题:

56%的考友选择了A选项

41%的考友选择了B选项

0%的考友选择了C选项

3%的考友选择了D选项

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