—How long at this job?　　—Since 1990.A. were you employedB. have you been employedC. had y

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A. were you employed
(答案→)B. have you been employed
C. had you been employed
D. will you be employed
解析：选择B。这道题根据答语可知选择现在完成时态，同时主语 you和动词employ属于被动关系，因此该题考察现在完成时态的被动语态。