They Hong Kong twice.　　A. have gone toB. have been to C. have been inD. have gone in

网友回答

A. have gone to
(答案→)B. have been to
C. have been in
D. have gone in
解析：考查谓语动词。have been to去过，已经回来了，have gone to去了，还没回来，根据句意可知选B。