--Have you ever been to Shanghai? -Yes. I there a few months agoA have been B. went

问题补充：

--Have you ever been to Shanghai?

---Yes. I there a few months ago.

A have been B. went C. have gone

答案：

解析：时态的用法。根据时间状语a few months ago可知，是一般过去时，故答案为B。