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_____ is known to us all that the sun rises in the east.
A.AsB.ThatC.WhichD.It
D              
             
试题分析:考查it做形式主语。题意 众所周知,太阳从东方升起。考查固定句型结构,it is known to sb that …某事是众所周知的。其中it 是形式主语,真正的主语是后面的that从句。          
考点  考查it做形式主语
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