问题补充：
This is the school I studied three years ago.
A. where
B. when
C. that
D. which
答案：
A. where
B. when
(答案→)C. that
D. which
解析：本题修饰名词school是一个定语从句，可用冠词特指，可用关系词that连接，故本题选C。
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