单选题
After the teacher left the room, the monkey began to ______.
A、
put one of its eyes to the keyhole
B、
be on guard(守卫，防护装置)
C、
look at the keyhole
【正确答案】
A
【答案解析】
根据最后一句话look at the teacher through the keyhole可以推断出答案。
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