He works as an engineer now but he on a farm for three years.A. has workedB. workedC. wa

问题补充：

He works as an engineer now, but he on a farm for three years.

A. has worked

B. worked

C. was working

D. had worked

答案：

A. has worked

(答案→)B. worked

C. was working

D. had worked

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