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

A．a(chǎn)fter B．before C．then D．when

B

解析試題分析：考查連詞：A. after在…之后，B. before 在…前面，C. then那時，D. when當(dāng)…時候，句意：通常，飛行員需要十年的經(jīng)驗才能被提升為機長。說明在被提升為機長前要十幾年的時間。選B。
考點：考查連詞

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