The factory we are going to visit produces puters.
A. which
B. to which
C. where
D. what
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(答案→)A. which
B. to which
C. where
D. what
解析：考查定语从句。本定语从句的先行词是the factory，定语从句的主语是we，动词是visit，后面缺宾语，说明使用关系代词，故A正确。Which指代先行词the factory作为visit的宾语。D不是定语从句的关系词。C只能做状语。故A正确。