What did Michael do after graduating from university?—He considered advertising before settling on teaching.He ____ that ever sinceA.did B.does C.has been doing D.had been doing

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What did Michael do after graduating from university?
—He considered advertising before settling on teaching.He ____ that ever since
A.did B.does C.has been doing D.had been doing

C
他在教书之前考虑了下广告学,他之后一直从事着它(教书)
表达从过去开始一直持续到现在一个状态 所以选择C
这道题是2013年北京市西城区的某次考试试题