The number 5.12 is a special number I think that will be remembered by the Chinese forev

问题补充：

The number 5.12 is a special number, I think, that will be remembered by the Chinese forever.

A. what

B. it

C. which

D. one

答案：

A. what

B. it

C. which

(答案→)D. one

解析：因为 that will be remembered by the Chinese forever 句中已有连词 that，所以应选择one作a special number的同位语，故答案D。