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Bill won't make any progress ______he studies harder than before.


  1. A.
    if
  2. B.
    when
  3. C.
    because
  4. D.
    unless
D
解析:考查连词。句意是“除非比尔比以前努力学习,否则就不能取得进步”,如果选其他选项,与句意不符。Unless=if not,除非,故选D。A项有否定含义,本题难度较大。
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