At the age of 18 he began to work__a teacher in a country school.A.as B.by C.in D.at

问题描述:

At the age of 18 he began to work__a teacher in a country school.A.as B.by C.in D.at

As作为

选A.as
意思是他18岁时开始在乡村小学当老师。

as
作为