问题
选择题
_____ is known to us all that the sun rises in the east.
A．As
B．That
C．Which
D．It
答案
D
题目分析：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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