（）the earth truns around the sun is known to us all。 A.that B.what C.which D.the fact
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选A。这是that引导主语从句，it 作形式主语，that 不能省略。
例如：
That she is a rich woman is known to us all. 众所周知，她是个富有的女人。
这句话可以改为用it 作形式主语的句型：It is known to us all that she is a rich woman.
例如：
That she is a rich woman is known to us all. 众所周知，她是个富有的女人。
这句话可以改为用it 作形式主语的句型：It is known to us all that she is a rich woman.
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