【单选题】
The discussion was so prolonged and exhausting that ______ the speakers stopped for refreshments.
A.at large
B.at intervals
C.at ease
D.at random
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根据网考网移动考试中心的统计,该试题:
18%的考友选择了A选项
55%的考友选择了B选项
24%的考友选择了C选项
3%的考友选择了D选项