问题补充：
The school I visited the other day was not the one I once studied.
A. that; which
B. which; where
C. where; which
D. where; where
答案：
A. that; which
(答案→)B. which; where
C. where; which
D. where; where
解析：考查定语从句。第一空先行词为the school在定语从句中作宾语，第二空先行词为the one，指代the school，在定语从句中作地点状语，选B。
