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
He ______ his old car for a new one as soon as he had won the prize.
A．replaced
B．converted
C．exchanged
D．interchanged
单项选择题
Violence is just one of the many problems ______ in city life.
A．abundant
B．inherent
C．substantial
D．coherent
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