It is exactly we behave has changed the world. A. which; thatB. how; thatC. how; whatD. wh

问题补充：

It is exactly we behave has changed the world.

A. which; that

B. how; that

C. how; what

D. what; that

答案：

A. which; that

B. how; that

C. how; what

(答案→)D. what; that

解析：句意“恰恰是我们的行为改变了世界的面貌。”去掉it is…that 句子仍然成立