The discussion was so prolonged and exhausting that________we had to stop for refreshments.

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问题 The discussion was so prolonged and exhausting that________we had to stop for refreshments.

选项 A、at large
B、at ease
C、at random
D、at intervals

答案D

解析 空格处是说我们时不时地得停下来休息。固定词组at intervals的意思是“时不时,每间隔一段时间就……”,如:He visits me at regular intervals.(他总是间隔一定时间来看我。)at large意为“未被捕,详尽,普遍”;at ease意为“安逸,自由自在”;at random意为“胡乱地,随便地”。四个选项中只有D项为正确答案。
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