Usually pilots need about a decade of experience _______ they can be promoted to
题型：不详难度：来源：
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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答案
| 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。 |
举一反三
_______ children get older, they become more and more interested in everything.| A．Once | B．Whether | C．With | D．As |
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You had better book rooms at the hotel in advance you should find no room on your arrival.| A．so that | B．even if | C．in case | D．now that |
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______ you talk or write a message to someone, you show your language skills to others.| A．Every time | B．Some time | C．At times | D．The time |
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_______ he was 12, Einstein had learned advanced mathematics by himself.| A．As soon as | B．At the time | C．By the time | D．During the time |
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Please tell me ______ you are getting on with your new classmates.| A．whether | B．how | C．what | D．where |
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