He had collected plenty of historical evidence proved that humans used to have different

问题补充：

He had collected plenty of historical evidence, proved that humans used to have different sleeping patterns.

A. that

B. which

C. it

D. what

答案：

A. that

(答案→)B. which

C. it

D. what

解析：考察定语从句。本题定语从句的先行词是plenty of historical evidence,后面的定语从句中的关系代词which指代先行词在句中作主语，that不能引导非限制性定语从句，it和what不能引导定语从句。句意：他已经收集了很多的历史证据，这些证据证明人类过去常常有不同的睡眠的方式。故B正确。