问题描述：
英语语法高手请帮我分析这句话
As ( ) announced in today's papers, the Shanghai Export Commodities Fair is also open on Sunday.
A.being B.is C.to be D.been
为什么选B不选A?请说详细点,谢谢!
As ( ) announced in today's papers, the Shanghai Export Commodities Fair is also open on Sunday.
A.being B.is C.to be D.been
为什么选B不选A?请说详细点,谢谢!
问题解答：
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