orange前加a,那orange前有形容词,加a还是an?例如a big orange,还是an big orange

orange前加a,那orange前有形容词,加a还是an?例如a big orange,还是an big orange orange前加an还是加a orange前用an还是a orange shirt前面加什么?加an还是a? _____green orange 前应该填a还是an 一个橘子是 an orange 还是 a orange Give me ( ) orange,please.I want ( ) big orange.A.an,an B.a, ( )orange jacket 前面填a还是an,这里orange是形容词, An orange is____ A.orange B.an orange C. This is___yellow orange,是a还是an orange（橘子）是a orange还是an orange或者是其它? This is ( ) orange flower A a B big C an