We won't be able to open the strong box ________ we get the key to it．


  1. A.
    until
  2. B.
    if
  3. C.
    because
  4. D.
    when
A
前句說“無法打開那個牢固的箱子”，后句說“拿到箱子的鑰匙”，有明顯的讓步關(guān)系，應(yīng)選用until，表示“只有拿來鑰匙才能打開箱子”；if表示條件；because表示原因；when表示時間狀語．
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