_____ is known to us all that the sun rises in the east.
A．AsB．ThatC．WhichD．It
D              
             
試題分析：考查it做形式主語(yǔ)。題意 眾所周知，太陽(yáng)從東方升起�？疾楣潭ň湫徒Y(jié)構(gòu)，it is known to sb that …某事是眾所周知的。其中it 是形式主語(yǔ)，真正的主語(yǔ)是后面的that從句。          
考點(diǎn)  考查it做形式主語(yǔ)
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