单项选择题

If you want to go to the concert, you'll have to make a ______, or there will be no tickets.

A．reservation
B．punctuality
C．compliment
D．clarity
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单项选择题
You'll find that the community has ______ great changes since you were here last time.
A．submitted
B．sustained
C．perceived
D．undergone
单项选择题
A considerable amount of time and money has been invested in ______ this system.
A．defining
B．implying
C．reducing
D．perfecting
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