◎ 题干
------Have you known each other for long?
------ Not very, ________we started to work in the ABC Motor Company.
A.before B.sinceC.whenD.after
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“------Have you known each other for long?------ Not very, ________we started to work in the ABC Motor Company.A.beforeB.sinceC.whenD.after…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。