问题
选择题
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
答案：B
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。