问题
选择题
The clever boy made a hole in the wall, _____ he could see _____ was going on inside the house.
A．which;what
B．throughwhich;what
C．throughthat;what
D．what;that
答案
答案：B
第一空考查定语从句，先行词为the wall，通过墙应用through which，第二空考查名词性从句中的宾语从句，从句中缺少主语，所以用what，故选B。