不多余.宾语从句里又是一个宾语从句,括号里that是指修饰centuries的that.哈哈.
再给一个句子,让你晕了的：
I think that that that that that student write on the blackboard is wrong.
这个句子的语法可是绝对正确.如果你没看过这句子.那就自己琢磨.
自己暗自说出每个that的成分和意思.
先卖关子.如果你分不清每个that的成分,可以问我~