The discussion was so prolonged and exhausting that ______ the speakers stopped

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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

解析介词短语辨析题。选项代入法。at large表示“未被捕，逍遥法外”；at intervals表示“不时，每隔一段时间”；at ease表示“安逸，自由自在”；at random表示“随意地，毫无次序地”。根据句意，选B。

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Thediscussionwassoprolongedandexhaustingthat______thespeakersstopped