born in manchester,he studied and later

问题描述:

born in manchester,he studied and later
——born in manchester,he studied and later worked as ceo of a famous company in chicago.
a.As b.Although c.Since d.When
为什么这里不能用as领导让步状语从句?

用AS必须有be 不然从句不完整.用although 前面省略了he was