用适当的介词填空,My father began to work _____a driver when he was 20 years old

题目

用适当的介词填空,My father began to work _____a driver when he was 20 years old

答案

My father began to work _as____a driver when he was 20 years old
我爸爸20岁的时候就作为一个司机出来工作了.