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问道高一英语题---How long _______ at this job?---Since 1990. &

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问道高一英语题
---How long _______ at this job?
---Since 1990.   
 A. were you employed                       B. have you been employed
 C. had you been employed               D. will you be employed
应该是B,他有since嘛,since不是现在完成时的标志词吗?