问题
选择题
—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
答案
答案：B
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。