2. 外语
  3. The meeting was so prolonged and exhausting that _________ the speakers stopped for refreshments.

The meeting was so prolonged and exhausting that _________ the speakers stopped for refreshments.

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问题 The meeting was so prolonged and exhausting that _________ the speakers stopped for refreshments.
选项 A、at large
B、at ease
C、at intervals
D、at random
答案C
解析 at intervals意为“不时，偶尔”，符合本题题意。at large作“详尽地，仔细地”讲，at ease意为“安逸，自由自由”；at random则意为“胡乱地，随便地”。因此C为正确选项。
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专业英语四级

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