Only that factory yesterday this kind of machines.
A. we visited; produces
B. did visited; does it produce
C. we visited; does it produce
D. did we visit; produce
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(答案→)A. we visited; produces
B. did visited; does it produce
C. we visited; does it produce
D. did we visit; produce
解析：考察only句式。当only放在句首，后面强调状语或者状语从句的时候，状语从句中不需要倒装，后面的主句使用部分倒装的形式。如果后面强调的不是状语，则不需要倒装。本句强调的是主语the factory，则不需要倒装。句意：只有我们昨天参观的那家工厂生产这种机器。故A正确。