He has worked in the city three years ago while his wife has been hereonly one month.A. s

问题补充：

He has worked in the city three years ago while his wife has been hereonly one month.

A. since , for

B. since, since

C. for, since

D. for, since

答案：

(答案→)A. since , for

B. since, since

C. for, since

D. for, since

解析：句意：他自从3年前就在这个城市工作，而他的妻子在这仅仅有一个月。For后面跟时间段，since后面跟时间点。故选A。