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 短语含义辨析题。at ease“自在,不拘束”;at random“随便地,任意地”;at intervals“不时,每隔一段时间”;at large“在逃;详尽的”。说话者应该是“不时停下”,故选C。
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