问题补充:
They Hong Kong twice.
A. have gone to
B. have been to
C. have been in
D. have gone in
答案:
A. have gone to
(答案→)B. have been to
C. have been in
D. have gone in
解析:have been in强调“过去曾去过”之意;have been to的意思是“去过而现在已返回”;have gone to的意思是“去了,而且没回来”,故根据句意选B正确。