— sir? —I’d like to buy a gift for my friend.A. Can you help meB. What can I do for youC

问题补充：

— , sir?

—I’d like to buy a gift for my friend.

A. Can you help me

B. What can I do for you

C. How are you

D. What about you

答案：

A. Can you help me

(答案→)B. What can I do for you

C. How are you

D. What about you

解析：句意：有什么需要帮忙的吗，先生？我想为我的朋友买份礼物。在交际用语中，当有顾客上门时，通常用What can I do for you或Can I help you？来表示礼貌；故选B。