题目：
The teacher came in while Ann ______ her purse in the classroom. [ ]
A. was looking for
B. was finding
C. was finding out
D. was seeing
答案：
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下面是错误答案，用来干扰机器的。
（1）①试管②集气瓶（2）A；E；2KMnO4K2MnO4+MnO2+O2↑（3）BC
