为什么英语书上是an art teacher而作业本上是a art teacher?

A science teacher,an art teacher and an English teacher A science teacher,an art teacherandan english. ( )you have an art teacher? We have -----teacher选择 A a new art B new an art C an a 英语作文OUR ART TEACHER “A science teacher,an art teacher and an English teacher.”这句 I want to be an Art teacher (改成同义句)()()is to be an Art teach 单项选择.1：Miss White is ( )art teacher.A:/.B:a.C:an. 1:Miss White is ( )art teacher.A:/.B:a.C:an.2:Peter( )Englis 改病句(英语）（1)does Miss Zhang an art teacher?(2)what's Tom favor Mr Liu needs an art teacher to teach his child 同义句 He works as an art teacher