He was generous with his time I was grateful.. A. for whichB. at whichC. with whichD. wi

问题补充：

He was generous with his time, I was grateful..

A. for which

B. at which

C. with which

D. with which

答案：

(答案→)A. for which

B. at which

C. with which

D. with which

解析：本题考查定语从句。be grateful for对……感激，故用for + which，选A。