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 best (最好的)way to pass an examination is to work hard all the year round.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
The teacher wondered ______.
A．if the monkey was the cleverest
B．how clever (聪明的，耿巧的) a monkey was
C．if animals were clever
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