【单选题】
The meeting was so prolonged and exhausting that______ the speakers stopped for refreshments.
A.at ease
B.at random
C.at intervals
D.at large
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根据网考网移动考试中心的统计,该试题:
4%的考友选择了A选项
1%的考友选择了B选项
77%的考友选择了C选项
18%的考友选择了D选项