This computer doesn’t work properly, because the operating system has         .
A．broken upB．broken down
C．broken outD．broken away
B
本題考查動(dòng)詞短語(yǔ)辨析。句意：因?yàn)椴僮飨到y(tǒng)出了故障。”break down“破壞；出故障”。
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