单项选择题

The last guests to reach the hotel ______ at 12 o'clock at night.

A．checked out
B．checked up
C．checked in
D．check on
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In today's rapidly changing economy, opportunities ______ for those who are motivated and dedicated to achieving their career goals.
A．abound
B．refrain
C．transcend
D．uphold
单项选择题
Monkeys are excellent climbers, and most are ______ tree dwellers.
A．often
B．primarily
C．rarely
D．savagely.
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