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词。at intervals 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 ease自在：不拘束。at random 随意地，胡乱地。at large 自由地：详细地：整体地。

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专业英语四级

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