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

A.after B.before C.then D.when

B

解析试题分析: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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