John had to pause from time to time to wipe the sweat off his forehead, because the air-conditioning system______.

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问题 John had to pause from time to time to wipe the sweat off his forehead, because the air-conditioning system______.

选项 A、broke in
B、broke out
C、broke up
D、broke down

答案D

解析 break in:打断;break out:爆发;break up:打碎,分手;break down:(机器等)出现故障。根据句意可知,选D。
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本试题收录于: 英语题库普高专升本分类
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