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：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。
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