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Wefeltitapitythattheresearchteamfailedtosuchaplanthadbeendescribedinthebotanist'sdiary.答案是as,为什么,这是什么从句?谁能分析一下句子结构?

题目详情
We felt it a pity that the research team failed to
such a plant _______ had been described in the botanist's diary.
答案是as,为什么,这是什么从句?
谁能分析一下句子结构?
▼优质解答
答案和解析
定语从句,as 引导定语从句,在从句中做主语.