He used to be a teacher,but he turned writer later.这句话对话还有：We selected him ____ A.a chairman B.chairman

He used to be a teacher,but he turned writer later.这句话对话还有：We selected him ____ A.a chairman B.chairman
He used to be a teacher,but he turned writer later.这句话对话
还有：We selected him ____ A.a chairman B.chairman

He used to be a teacher,but he turned writer later.这句话对话还有：We selected him ____ A.a chairman B.chairman
TURNED TO BE A .
B

他以前是个老师,但不久他改做了作家
B

B
代表一种头衔

上面那个要干什么？
B

他过去是个老师, 但后来,他转行成了作家。

chairman
n.[C]
1. 主席;议长;委员长;董事长
2. (大学的)系主任
可数,选A
He used to be a teacher, but he turned to ba a writer later.
My own idea.

那句话是对的，意思是他过去是个老师，但后来转行成了作家。
选B，做him 的同位语。且职位和头衔前不加冠词，但更好的说法是We selected him as a chairman.

B职位\头衔之前不加定冠词

B