Question

The clever boy made a hole in the wall, ________ he could see what was going on

The clever boy made a hole in the wall, ________ he could see what was going on inside the building.
A. on which
B. at which
C. through which
D. in which

Answer 1

答案C
这题考查定语从句：介词+which，句意是：聪明的男孩在墙上打了个洞，通过这个 洞他可以看到大楼里发生的事。选C。