The clever boy made a hole in the wall, ________ he could see what was going on inside the building....
2023-01-16 05:45:20 119次 2011年北京市东城区高一下学期期末考试英语题 单项填空 反馈错误 加入收藏 正确率 : 100%
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 which B. at which C. through
which D. in which
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