He was ____ medical student before he turned ___writer冠词填空原因
问题描述：
He was ____ medical student before he turned ___writer冠词填空
原因
答
He was __a__ medical student before he turned the___writer
答
He was a medical student before he turned writer.
注释：turn（变成）后面接职业名称时不加冠词,这是习惯用法.