the number 911 is a special number ,one,i think ,that will be remembered by the American forever

问题描述:

the number 911 is a special number ,one,i think ,that will be remembered by the American forever
如题:为什么用one?不能用which呢?其中的原理是什么?还有那么多的逗号,就把我给搞晕了这个“one”‘i think’是作为插入语的么?这个one是指代的“911”么?请给我具体的解释!

i think是插入语.你可以去掉,i think ,句子结构就清楚了.
one that will be ...是a special number的同位语,其语法结构是正确的.如果换成 which that will be ...语法结构就不对了,必须去掉that才是正确的.