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

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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