He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ____________

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1. (2012·陕西) 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

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使用过本题的试卷

2012年高考英语真题试卷（陕西卷）