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it known to all和as is known to all有什么区别?

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it known to all和as is known to all有什么区别?
______is known to all,good friends add hapiness and value to life.
答案说是填as,为什么不能填it呢?两者有什么区别
it known to all和as is known to all有什么区别?
因为填it的话就会有两个主句,前面一句,后面一句,这是不符合语法的.填As的话前面一句就是从句,就可以.单独用都没错