a bag

a bag an opp bag 还是 a opp bag? a bag还是an bag?为什么? I have a bag. a bag lady a bag of rice A bag of b_____. a bag of wind a bag of wind I want a bag对a bag提问 he wants a green bag 对：a green bag 提问 jim needs a bag(对a bag提问) a small red bag 还是 a red small bag? Did she____(has) a bag? bag的a音标是什么 that bag is a black Do you ( )a big bag THIS BAG IS NOT A