问题
选择题
15. The hiding man made a hole in the wall ______ he could observe the outside.
A．in which
B．by which
C．through which
D．with which
答案
答案：C
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15. The hiding man made a hole in the wall ______ he could observe the outside.
A．in which
B．by which
C．through which
D．with which
答案：C