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 A项at large“详尽的”;B项at ease“安逸,自由自由”;C项at intervals“不时”,符合本题题意;D项at random“胡乱地,随便地”。因此C为正确选项。
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