—Where have you been ________Hainan Island？—I went to San Ya and went diving __________Yalong Bay.（　　）A. in，onB. on，inC. in，atD. on，for

—Where have you been ________Hainan Island？—I went to San Ya and went diving __________Yalong Bay.（　　）A. in，onB. on，inC. in，atD. on，for

HainanIsland海南岛，on用在小岛前，排除AC；根据"wentdiving"，可知应该是在海龙湾里潜水，在某个地方的内部应该用in，

故选：B。