a apple和an apple哪种写法正确?看到有些视频上说的a apple,但是以前都是说an apple,书上也是这样,到底哪种说法对?是不是现在改了?

a apple和an apple哪种写法正确?看到有些视频上说的a apple,但是以前都是说an apple,书上也是这样,到底哪种说法对?是不是现在改了? an.Apple.a. an apple a day a red apple或者an red apple an apple and a half以及one and a half apple和half an apple分别用is还是are? 请问为什么苹果和鸡蛋要用,an apple、an egg 而不是a apple、a egg An Apple a Day 歌词 quite和ratherrather an beautiful apple还是an rather beautiful apple?quite an beautiful apple还是an quite beautiful apple? a apple juice 对 还 是 an apple juice 对 是a apple tree还啊an apple tree? 是a apple tree还是an apple tree? half an apple 还是a half apple还是都可以 首字母填空what apple is not an apple?A What a delicious apple还是What an delicious apple? Has she an apple.和Does she have apple. I want to eat an apple and a orange.那两个是宾语?an apple 和 a orange还是apple 和 orange? 关于an apple a day,keeps the doctor away到底是an apple a day an apple one dayone apple a day还是one apple one day an apple a day keeps doctors away 出自哪