---Can I help you?I want to buy something presents my mother.A. for; forB. as; forC.

问题补充：

---Can I help you?

--- I want to buy something presents my mother.

A. for; for

B. as; for

C. as; to

D. like; to

答案：

A. for; for

(答案→)B. as; for

C. as; to

D. like; to

解析：句意：我能为你服务吗？我想为妈妈 买做为礼物的东西。AS 作为，for为了……，故选B