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 ease
B、at random
C、at intervals
D、at large
答案C
解析 此题考查作状语用的介词短语。C项at intervals意为“不时地”，介词和名词间可插入形容词，如：at long intervals偶尔；at short intervals频频; at regular intervals每隔一定的时间。A项at case意为“自在；不拘束”。B项at random意为“随意地；胡乱地”。D项at  large意为“自由地；详细地；整体地”。
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