As ______announced in today’ s papers, the Shanghai Export Commodities Fair is also open on Sundays.

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问题 As ______announced in today’ s papers, the Shanghai Export Commodities Fair is also open on Sundays.

选项 A、being
B、is
C、to be
D、been

答案B

解析 as可用作关系代词,引导定语从句,起承接前面主句的内容或引出后续主句的内容的作用,as在从句中作主语或宾语,指代整个主句。有时,助动词be可以省略。
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