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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