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 case
D、at random

答案B

解析 at large“自由行动，逍遥自在地”；at intervals“不时，时时”；at case“不紧张，自由自在”；at random“随便，随机的，随意的”。根据句意和各个选项的意思可知，正确答案是B。

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