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 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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