Tom has been in the factory ______ he left school.A、whenB、as soon asC、sinceC考

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问题 Tom has been in the factory ______ he left school.

选项 A、when
B、as soon as
C、since

答案 C

解析考察现在完成时的时间状语表达。since表示“自从”，when“当……时候”，as soon as表示“一……就……”。

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