单项选择题

A．first
B．later
C．repeatedly
D．often
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单项选择题
A．littleB．a littleC．fewD．a few
A．little
B．a little
C．few
D．a few
单项选择题
A．advanceB．in advanceC．advancedD．advancing
A．advance
B．in advance
C．advanced
D．advancing
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