◎ 题干
He had to pause from time to time to wipe the sweat from his forehead, because the
air-conditioning system ____.
[     ]
A. broke in
B. broke up
C. broke out
D. broke down
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ____.[ ]A. broke in B. broke up C. broke out D. b…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。