The factory is used to be an art museum, people could learn about various cultures.
A. What; where
B. Where; where
C. What; which
D. where; that
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(答案→)A. What; where
B. Where; where
C. What; which
D. where; that
解析：考察从句连词的选择，第一空为表语从句，从句中缺少used的主语，因此选择what，第二空是定语从句，先行词是art museum,在后面的从句中充当地点状语，因此选择A。