The place you are going to visit is the ruins (废墟) of the World Trade Center.
A. which
B. at which
C. where
D. in which
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(答案→)A. which
B. at which
C. where
D. in which
解析：考查定语从句。本题定语从句的先行词是the place，定语从句中的动词visit缺少宾语，使用which知道先行词作为visit的宾语。句意：你要去参观的地方是世界贸易中心。故A正确。