The meeting was so prolonged and exhausting that______ the speakers stopped for

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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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