The discussion was so prolonged and exhausting that________ the speakers stopped for refreshments.

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问题 The discussion was so prolonged and exhausting that________ the speakers stopped for refreshments.

选项 A、at large
B、at intervals
C、at ease
D、at random

答案B

解析 本题句意:讨论会如此之长,让人筋疲力尽,以至于讲话者每隔一段时间都要停下来提提神。at intervals意为“不时地,定期”,符合题意。at large意为“详尽地,整个地”,at ease意为“舒适地,自由自在”,at random意为“随机地”,故选B。
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