—Can I help you sir?—.A. Yes you canB. No I don’t buy anythingC. Of course if you likeD

问题补充：

—Can I help you,sir?

—.

A. Yes,you can

B. No,I don’t buy anything

C. Of course,if you like

D. No,thanks.I’m being served

答案：

A. Yes,you can

B. No,I don’t buy anything

C. Of course,if you like

(答案→)D. No,thanks.I’m being served

解析：服务场所用语。No,thanks.I’m being served.谢谢，有人为我服务了。