1.He works in a factory now,but he____on a farm for 20 years.

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1.He works in a factory now,but he____on a farm for 20 years.
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1.He works in a factory now,but he____on a farm for 20 years.
1.He works in a factory now,but he____on a farm for 20 years.

1.He works in a factory now,but he____on a farm for 20 years.
had worked
for说明用完成时,
但他现在已经不在农场啦`那20年的工作是过去完成的.

has worked

worked

has worked 肯定对