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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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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