The discussion was so prolonged exhausting that ______ we had to stop for refreshments.

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问题 The discussion was so prolonged exhausting that ______ we had to stop for refreshments.

选项 A、at large
B、at ease
C、at random
D、at intervals

答案D

解析 这场讨论持续得太久,让人太疲惫了,我们不得不停下来吃点东西休息一会。A选项:最后,最终。B选项:稍息。C选项:随意。D选项:间隔地。
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