Jasmine was holidaying with her family in a wildlife park ________ she was bitten on the leg by a lion．
A.whenB.whileC.sinceD.once在线课程A
解析：
while引导的句子中的谓语动词为延续性动词或状态性动词；
when引导的句子中的谓语动词可为延续性或非延续性动词．bite为非延续性动词，when在此处为并列连词，意为“这时”．