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名词性从句之主语从句It is known__________ one and one makes two is cor

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名词性从句之主语从句
It is known__________ one and one makes two is correct
A that that
B that what
选A 为什么不是B
thank you!
首先这个是强调句,是it is that的从句
然后这是名词性从句中的助于从句,it指代that引导的从句,从句中不缺少任何成分,所以用that连接,A中的第一个that是强调句中的that,第二个that是主语从句的引导词