类型：单选题

问题： The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.

选项：

A. which; what

B. through which; what

C. through that; what

D. what; that

答案：B

解析：

本题考点是非限制性定语从句和名词性从句，在非限制性定语从句中，先行词指物，且介词提前时，用which, 在名词性从句中缺少主语，根据语境可判断，指物用what, 指人用who. （选用-ever类的词再根据具体语境判断）。本题中，先行词 hole，指物，且介词提前，因此选用through which, see.. through“ 通过...看..."," _____ was going on inside house"属于see后的宾语从句，从句中缺少主语，根据语境，判断是缺少”什么“之意，因此选用what。本句句意为：这个聪明的男孩在墙上挖了一个洞，通过洞口可以看到屋内发生了什么。