Question

"Ben has been quoted as saying that the old have a duty."请问这句话的句子成分怎么分析啊？

as引导的是同位语从句还是什么？

Answer 1

你好。是简单句。
quote A as B 把A引证为B----------QUOTE(是谓语) A (是宾语）as是介词，B是介词的宾语

Ben （主语）has been quoted （谓语）as（介词） saying that the old have a duty（介词的宾语）

Answer 2

quote sb as saying....(sb = be quoted as saying....)

as (doing) sth, 作为……，如是……，像这样……
是 介词短语 作方式状语，saying that- 后面是 saying 的宾语从句，这是另一码事。