The computer system _____suddenly while he was surfing the Internet.
A．broke upB．broke outC．broke inD．broke down
D
短語辨析。A關(guān)系破裂；分解；B爆發(fā)；C闖入；D機(jī)器壞了，身體垮了；分解；拋錨；崩潰；結(jié)合句意可知D正確。句意：當(dāng)他在上網(wǎng)的時候，計算機(jī)系統(tǒng)突然就崩潰了。
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