单项选择题

Turning back down the main street, we______ our pace and made our way rapidly towards the hotel.

A．quickened
B．fastened
C．loosened
D．tightened
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单项选择题
______rose in his imagination several interesting specimens that had never appeared on earth before.
A．Here
B．It
C．Where
D．There
单项选择题
It is human nature to think back to a Golden Age ______one's country was strong and respected.
A．when
B．provided
C．as
D．unless
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