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 题型:词汇题。此题考查作状语用的介词短语。at intervals不时地,相隔一定距离。介词和名词间可插入形容词,如:at long intervals间或;at short intervals频频,常常。at ease自在;不拘束。at random随意地,胡乱地。at large自由地,未被捕的。如:He was still at large.他仍然逍遥法外。
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