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as做介词,necessary做名词么?

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as做介词,necessary做名词么?
Zoos are sometimes seen as necessary but not poor alternatives to a natural environment. Discuss some of the arguments for and/or against keeping animals in zoos.
as做介词,necessary做名词么?
楼上这位分析得不对,necessary 绝对是形容词,名词是necessaries.这里的句子结构是这样的:(Zoos) (are sometimes seen) as (necessary but not poor alternatives) to a natural environment.
as是介词没错,但它是修饰后面alternatives (替代品)的,necessary but not poor(必要而又不廉价的)是一个整体作alternatives的定语.necessary和 as 两者并没有直接联系.