Only that factory we visited yesterday this kind of machines.
A. produces
B. does it produce
C. did it produce
D. producing
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(答案→)A. produces
B. does it produce
C. did it produce
D. producing
解析：考查时态。句意：只有我们昨天参观的那家工厂才生产这种机器。结合语境可知本句描述的是客观存在的事实，故用一般现在时态。为后置定语从句，only在本句中是形容词，意思是仅有的，故选A。