问题描述: He had been ( )teacher and then he turned ( )doctor.职务前不是零冠词吗?为什么第一个空填 a 1个回答 分类:英语 2014-10-08 问题解答: 我来补答 he had been a teacher,可以理解为他曾是一名老师.turned doctor可以理解为转行为医生.医生在这里是一个职业,不用加冠词. 展开全文阅读