单项选择题

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
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单项选择题
The teacher wanted to watch the monkey ______.
A．how to look for the small boxes
B．how to look for the food
C．how to eat the food
单项选择题
A biology teacher made several tests with different animals tn find out which animal was the cleverest ______.
A．before long
B．long before
C．not long ago
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