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
He offered to______ her a hand as the bag was too heavy for her to carry.
A．lend
B．help
C．show
D．borrow
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