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
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单项选择题
I arrive at nine o'clock, teach until twelve thirty and then have a meal; that is my morning ______.
A．habit
B．custom
C．practice
D．routine
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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