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 词组辨析。根据句子中的so…that结构判断,空格应填入与prolonged意思相对的词组。选项中,at intervals意为“不时,时时”,句意“……使人筋疲力尽,发言的人不时停下来喝点饮料”。故答案为B。at large“自由行动,逍遥自在地”。
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