问题补充：
October 1, is a special day, I think, that will be remembered by all the Chinese forever.
A. which
B. what
C. it
D. one
答案：
A. which
B. what
C. it
(答案→)D. one
解析：考查代词做同位语。one作a special day的同位语，I think可看作插入语。that引导的为定语从句修饰限定one。句意：10月1号是个特殊的日子，我想是所有的中国人会永远记住的日子。选D。
