题目内容

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