The clever boy made a hole in the wall, __( )he could see what was going on inside the house. ( )(
A.in which B.through which C.at which D.on which正确答案B
The clever boy made a hole in the wall, __( )he could see what was going on inside the house. ( )(
A.in which B.through which C.at which D.on which正确答案B