The clever boy made a hole in the wall he could see was going on inside house. A. which

问题补充：

The clever boy made a hole in the wall, he could see was going on inside house.

A. which; what

B. through which; what

C. through that; what

D. what; that

答案：

A. which; what

(答案→)B. through which; what

C. through that; what

D. what; that

解析：through which引导定语从句，through which即through the hole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。