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 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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