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As is announced in today's papers,the Shanghai Export Commod

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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 Commod
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”