题目内容
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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