问题补充：
Is this school you visited last year?
A. where
B. that
C. the one
D. which
答案：
A. where
B. that
(答案→)C. the one
D. which
解析：考查句子结构和定语从句。本句的主语是this school系动词is后面缺表语，定语从句也缺先行词。The one既在句中做表语，也作为后面句子的先行词。在the one后面省略了that, that指代the one在句中作为visit的宾语。故C正确。
