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    精英家教网 > 高中英语 > 题目详情

    Usually pilots need about a decade of experience _______ they can be promoted to captain


    1. A.
      after
    2. B.
      before
    3. C.
      then
    4. D.
      when
    B
    试题分析：考查连词：A. after在…之后，B. before 在…前面，C. then那时，D. when当…时候，句意：通常，飞行员需要十年的经验才能被提升为机长。说明在被提升为机长前要十几年的时间。选B。
    考点：考查连词
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