Chengdu is a city you hate to say goodbye once you have visited it.A. in whichB. at which

问题补充：

Chengdu is a city you hate to say goodbye once you have visited it.

A. in which

B. at which

C. to which

D. with which

答案：

A. in which

B. at which

(答案→)C. to which

D. with which

解析：考查定语从句。say goodbye to sb.对某人再见，故用to +which，选C。