At last our head teacher who broke the window of the classroom.A. looks forB. finding C.

问题补充：

At last our head teacher who broke the window of the classroom.

A. looks for

B. finding

C. found

D. found out

答案：

A. looks for

B. finding

C. found

(答案→)D. found out

解析：词义辨析。looks for寻找；finding发现； found 发现；found out查明。句意：最后我们的校长查明了是谁打碎了教师的窗户。故选D。原答案有误。