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 at intervals不时，时时。A．at large逍遥法外，未被捕获；C．at ease自在，合适；D．at random任意，随机。

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