A.What do you want to do?B.Where are you from?C.Can I help you?

【答案】C

【解析】

A. What do you want to do?你想要的做什么？B. Where are you from?你来自哪里？C. Can I help you?我能帮你吗？走进商店，服务员会对你说我能帮你吗，故选C。