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单选题
__________ is known to all , Peking University is one of the most famous universities in China.
A
It
B
As
C
What
D
That
答案解析
正确答案：B
解析：
参考解析: as作关系代词引导定语从句时，常位于句首意为"正如...这一点”，且常和动词know/show等连用用以指代整个主句所表达的内容;另外,，当先行词被the same或such等词修饰时，也要用as来引导。it和what不能作关系代词引导定语从句，that不能引导非限制性定语从句，故选B。
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