He works in a factory now but he on a farm for 20 years.A. workedB. has workedC. had work

问题补充：

He works in a factory now, but he on a farm for 20 years.

A. worked

B. has worked

C. had worked

D. had been working

答案：

(答案→)A. worked

B. has worked

C. had worked

D. had been working

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