This computer doesn’t work properly, because the operating system has         .


  1. A.
    broken up
  2. B.
    broken down
  3. C.
    broken out
  4. D.
    broken away
B
本題考查動詞短語辨析。句意：因?yàn)椴僮飨到y(tǒng)出了故障�！眀reak down“破壞；出故障”。
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