------Have you known each other for long?---Not very we started to work in the ABC Mo

问题补充：

------Have you known each other for long?

------ Not very, we started to work in the ABC Motor Company.

A. before

B. since

C. when

D. after

答案：

A. before

(答案→)B. since

C. when

D. after

解析：考查介词，before 意思“在…之前”，since意思“自从”，when意思“当什么时候”，after意思“在…之后”，句子意思“自从我们开始在美国汽车公司”，所以选B

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