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 本题的四个选项都是介词短语。根据讲话者停下来提提神,可以推知,B项“有时,每隔一段时间”与本题所表达的意思相符合。A项“一般说来”,C项“自在”和D项“任意”都与题意不符。
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