Can I use my Fijian passport to travel to china if I am dual citizen and have use my Australian b4.

Hi I am a daul citizen and I hold dual passport for Australia and Fiji. I did trael to china two years ago on my Australian passport but I want use my Fijian passport this time. I did went Chinese embassy with this question and they wouldn't tell me weather I can travel on my Fijian passport or no. They told me to check with airline.