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
考查时态：因为时间是since1990，所以用现在完成时，而且你是被雇佣，所以用现在完成时的被动式，句意是;--你受雇于这个工作多久了？--自从1990年。选B。