<prompt> Bhala ukuqhubeka kwalesi sigaba - Eminyakeni emine kamuva, uChoi wafanelekela imicimbi emibili yokubhukuda kuma-Olimpiki asehlobo ka-2012 eLondon ngokuqeda izikhathi zokungena ezijwayelekile ze-FINA A zika-2:13.00 i-200 m medley yomuntu ngamunye no-2:08.81 i-200 m butterfly kusuka kuma-FINA World Championships eShanghai, eChina. Emncintiswaneni wamamitha angama-200, uChoi waqeda isizini yesine endaweni yesithupha ngo-0.19 wesekhondi ngemuva kukaSophie Allen waseGreat Britain, wehlisa isikhathi sakhe se-Olympic saba ngu-2:14.91. Ubekwe endaweni engamashumi amabili nane emidlalweni yokuqala, futhi akazange aqhubekele phambili emidlalweni yokugcina. Ngokungafani nama-Olympics akhe adlule, uChoi waqopha isikhathi seshumi esisheshayo esingu-2:08.45 emjahweni wama-200 m butterfly  <response>: ukuze aqiniseke ngendawo yakhe kuma-semi-finals emidlalweni yokuqala yasekuseni. UChoi wehlulekile ukungena emdlalweni wamanqamu, njengoba aqeda umjaho wama-semifinal nesikhathi sesithathu esincane kunazo zonke esingu-2:08.32. 