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
試題分析：考查連詞：A. after在…之后，B. before 在…前面，C. then那時(shí)，D. when當(dāng)…時(shí)候，句意：通常，飛行員需要十年的經(jīng)驗(yàn)才能被提升為機(jī)長。說明在被提升為機(jī)長前要十幾年的時(shí)間。選B。
考點(diǎn)：考查連詞
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