问题补充：
Is this school I visited last year?
A. that
B. in which
C. the one
D. where
答案：
A. that
B. in which
(答案→)C. the one
D. where
解析：这题考查代词的用法，分析句子成分，我们发现，this school是主语，is是连系动词，I visited last year是定语从句，而缺少先行词，所以用the one代指the school，the one后面省略了关系代词which或that。句意是：这个学校是你去年参观的吗？选C。
