He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system _________.
A．broke inB．broke upC．broke outD．broke down
D

試題分析：A. broke in闖入，插話，B. broke up 分手，解體，C. broke out 爆發(fā)，D. broke down崩潰，破裂，出故障，句意：他不時(shí)的停頓擦前額的汗，因?yàn)榭照{(diào)系統(tǒng)出故障了。所以選D。
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