在yellow orange之前是用a还是an?

在yellow orange之前是用a还是an? 一个橘子是 an orange 还是 a orange This is___yellow orange,是a还是an orange前用an还是a orange（橘子）是a orange还是an orange或者是其它? 一件橙色的外衣用英语怎么说?（是a orange jacket 还是 an orange jacket)求大神帮助 orange前面的冠词是a还是an? ( )orange jacket 前面填a还是an,这里orange是形容词, 是It's a orange quilt,还是It's an orange quilt. 是it's a orange hat ,还是 it's an orange hat? This is _ orange orange 该用an还是a 急. orange前加an还是加a