The place you are going to visit is the ruins (废墟) of the World Trade Center.A. whichB. a

问题补充：

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

答案：

(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。