Many people tend to buy things from big store they believe the qualities are good. A. at

问题补充：

Many people tend to buy things from big store, they believe the qualities are good.

A. at which

B. of which

C. which

D. where

答案：

A. at which

(答案→)B. of which

C. which

D. where

解析：答案：B。考查定语从句。句意：很多人期望从大商场买东西，他们认为那里的东西质量好。The qualities of things from big stores are good，所以选of which。