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。