Usually pilots need about a decade of experience _______ they can be promoted to captain. A. after B...
2022-12-05 11:01:45 94次 2014届山西太原第五中学高三上期10月月考英语卷(解析版) 单项填空 反馈错误 加入收藏 正确率 : 100%
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
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