— Is this the painting you offered $1 000 for on the Internet?—Yeah I will give you 15%

问题补充：

— Is this the painting you offered $1,000 for on the Internet?

—Yeah,I will give you 15% discount if you like it. 

A. when

B. which

C. as

D. what

答案：

A. when

(答案→)B. which

C. as

D. what

解析：本题考查定语从句，which在定语从句中作for的宾语。