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关于新概念英语二的第31课,Before he retired,Frank was the head of a very

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关于新概念英语二的第31课,Before he retired,Frank was the head of a very large busin...
关于新概念英语二的第31课,Before he retired,Frank was the head of a very large business company,but as a boy he used to work in a small shop.为什么不是work at a small shop?我记得in指大地方,at指小地方,还望大家给我解释这里的原因?这里的As是什么用法呢?
是不是in a small shop在句中作状语,As作介词和联词主要区别在哪?
as a boy 是个介词短语啦 意思是 作为...
做连词的时候 as he was a boy,he used to work in a small shop.
当..时候,相当于when