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 outD．broke down
D
考查動(dòng)詞短語(yǔ)辨析。break in打斷； 闖入； 開始工作；break up結(jié)束，散開；分解；break out爆發(fā)；break down崩潰，垮掉；出毛病；拋錨。題干意思是：他時(shí)不時(shí)地停下來(lái)擦去額頭的汗水，因?yàn)榭盏舫雒×恕＿xD。
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