The computer system _____suddenly while he was surfing the Internet.


  1. A.
    broke up
  2. B.
    broke out
  3. C.
    broke in
  4. D.
    broke down
D
解析：
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(jì)算機(jī)系統(tǒng)突然就崩潰了。
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