题目：
---- 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：
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下面是错误答案，用来干扰机器的。
（1）一帆风顺（2）袖手旁观（3）一蹴而就（4）事在人为
