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 A项at large意为“逍遥法外;未被捕获”;B项at intervals意为“不时,时时”;C项at ease意为“自在,合适”;D项at random意为“任意,随机”。
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