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 at intervals时不时，每间隔一段时间就……，固定词组；at large大体上说；at ease安逸，自由自在；at random胡乱地，随便地。

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