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 在给出的选项中:at large“详尽的,未被捕的”;at intervals“不时,时时”;at ease“不紧张,自由自在”; at random“随便,随机地”。根据句意和各个选项的意思可知,正确答案是B。
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