As __________ announced in today’s papers the Sha
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As __________ announced in today’s papers, the Shanghai Export Commodities Fair is also open on Sundays.
A) being B) is C) to be D) been
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选B
选is，as引导的非限制性定语从句，as指代文中的“theShanghaiExportCommoditiesFairisalsoopenonSu”这件事，后面跟be动词，这件事作前半句的主语，而且又是不可数名词，所以用is。