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Only the factory ____ yesterday ____  this kind of machines.

A. did we visit; does it produce          B. did we visit; produces

C. we visited; produces                     D. we visited; does it produce

Only the factory ____ yesterday ____  this kind of machines.

A. did we visit; does it produce          B. did we visit; produces

C. we visited; produces                   D. we visited; does it produce

Only the factory ____ yesterday ____  this kind of machines.