No one really knows exactly when the first people arrived in we now know as New Zealand.A

问题补充：

No one really knows exactly when the first people arrived in we now know as New Zealand.

A. that

B. which

C. what

D. where

答案：

A. that

B. which

(答案→)C. what

D. where

解析：本题考查名词性从句。What在句子引导宾语从句，在从句中作know的宾语。句意：没有人确切的知道什么时候第一个人到达我们现在所知道的新西兰。