单项选择题

Jean did not have time to go to the concert last night because she was busy ______ for her history examination.

A．to prepare
B．preparing
C．to be prepared
D．being prepared
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单项选择题
Frankfurt, Germany, is one of the most ______ populated regions in Western Europe.
A．densely
B．vastly
C．enormously
D．largely
单项选择题
Having been found guilty, the man was given a severe ______ by the judge.
A．service
B．sentence
C．crime
D．crisis
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