as+a+名词,在句中所承担的语法成份是什么?比如这句话:She looked on him a

great scholar.

你说的结构,在句子中的语法成分不唯一。例如
As a student ,Tom works hard at his lessons.
介词短语,做状语。
She looked on him as a great scholar.
look on sb as 是固定短语,a great scholar 作介词as的宾语。
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