September 18th 1931 is a special day I think that will be remembered by the Chinese f

问题补充：

September 18th, 1931 is a special day, ， I think, that will be remembered by the Chinese forever.

A. one

B. it

C. which

D. that

答案：

(答案→)A. one

B. it

C. which

D. that

解析：A 考察代词。句意：我认为1931年9月18日是一个很特别的日子，一个中国人都永远不会忘记的日子。分析句子结构，I think是插入语，that will be remembered by the Chinese forever是定语从句，句中有关系代词that，但是前面缺少先行词，因此排除CD两项，空格处还缺少一个名词或者代词做先行词，同时又作为a special的同位语。故A正确。