The camera is a souvenir(纪念品) by my uncle for me when he went to Japan. I do like it.A. to

问题补充：

The camera is a souvenir(纪念品) by my uncle for me when he went to Japan. I do like it.

A. to buy

B. to be bought

C. bought

D. buying

答案：

A. to buy

B. to be bought

(答案→)C. bought

D. buying

解析：这里主句已经有谓语动词is，所以buy用它的非谓语动词的形式，souvenir与buy是被动关系，故排除AD；to be bought表示将来被买，不符句意；又因为相机是叔叔去日本时买的，故选C。