As is announced in today's papers,the Shanghai Export Commodities Fair is also open on Sundays.的语法结构?我想知道为什么前面as后可以直接接系表结构?

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As is announced in today's papers,the Shanghai Export Commodities Fair is also open on Sundays.的语法结构?我想知道为什么前面as后可以直接接系表结构?

As is announced in today's papers,the Shanghai Export Commodities Fair is also open on Sundays.的语法结构?我想知道为什么前面as后可以直接接系表结构?
As is announced in today's papers,the Shanghai Export Commodities Fair is also open on Sundays.
的语法结构?
我想知道为什么前面as后可以直接接系表结构?

As is announced in today's papers,the Shanghai Export Commodities Fair is also open on Sundays.的语法结构?我想知道为什么前面as后可以直接接系表结构?
as单独引导定语从句时,先行词可以是一个词,也可以是一个句子或短语.例如：
　　(1) She is late,as is often the case.她迟到了,这是经常的事.(先行词是整个主句)
　　(2) To shut your eyes to facts,as many of you do,is foolish.对事实视而不见--你们好多人都是如此的愚蠢.(先行词是不定式短语)
这句话应该是第一种,先行词是整个后面的主句.意思是“今天的报纸上有宣布,上海商品出口贸易交易会也在周日举行”

这个是as 引导的非限定性定语从句结构吧， as作主语，表示”正如“。

状语从句？

As 意思：正如 此句可意为：正如今日日报所发表的，这个上海商品出口展览会在每个周日都会举行。
As在此作为关系代词 引导定语从句 be announced in ...在...发表、发布；在...宣称、宣告
export commodity 商品出口 fair作名词意为展览会 on sundays 每个周日...

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As 意思：正如 此句可意为：正如今日日报所发表的，这个上海商品出口展览会在每个周日都会举行。
As在此作为关系代词 引导定语从句 be announced in ...在...发表、发布；在...宣称、宣告
export commodity 商品出口 fair作名词意为展览会 on sundays 每个周日

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