很高興為你解答.

保證正確率~!



有好幾種改法呢,分別如下：
1、It is known to all that Taiwan belongs to China. 
（ It 作形式主語,that 引導(dǎo)真正主語）
2、As is know to all , Taiwan belongs to China. 
（ As 引導(dǎo)的非限制性定語從句）
3、What is known to all is that Taiwan belongs to China. 
（ What 引導(dǎo)的主語從句）
4、That Taiwan belongs to China is known to us all.
( That 引導(dǎo)的主語從句）
    眾所周知,臺(tái)灣屬于中國.


祝開心~!