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

问题补充：

—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

答案：

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。