问题补充：
--Do you know where Mr Brown is?---He Beijing for two days.
A. has been to
B. has gone to
C. has been in
D. went to
答案：
A. has been to
B. has gone to
(答案→)C. has been in
D. went to
解析：句意：你知道布朗先生在哪吗？他去北京两天了。和一段时间连用，瞬间动作要用相应的延续性动作或状态来代替。go的延续性状态是be in。 has / have gone to...去了某地，强调该人不在说话地点；has / have been to... 曾经去过某地，强调有过去某地的经历。went 过去式。故选C。
