—Excuse me could you tell me where ?—Sure sir. You can try www.taobao.com. A. can I join

问题补充：

—Excuse me, could you tell me where ?

—Sure, sir. You can try .

A. can I join in the group-buying

B. did I join in the group-buying

C. I can join in the group-buying

D. I joined in the group-buying

答案：

A. can I join in the group-buying

B. did I join in the group-buying

(答案→)C. I can join in the group-buying

D. I joined in the group-buying

解析：英语宾语从句中一般为陈述语序。根据下文，当然了，先生。你可以在淘宝上试试。可知上文问的是，打扰了，你能告诉我我能在哪儿加入团购吗？选项D描述的是过去的动作，故选C。