--Where did you go on vacation?--I .A. stay at home B. went to the beach C. visit my uncle

问题补充：

--Where did you go on vacation?

--I .

A. stay at home B. went to the beach C. visit my uncle

答案：

解析：句意：——你去哪里度假了？——我去了海滩。A. stay at home 呆在家里；B. went to the beach去了海滩； C. visit my uncle 拜访我叔叔。根据did可知，这是在询问过去的事，因此回答时应用一般过去时，故选B。