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。
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