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【单选题】

I must have hung ______ for ten minutes before the telephone operator put me through.
A.up

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

20%的考友选择了A选项

8%的考友选择了B选项

66%的考友选择了C选项

6%的考友选择了D选项

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