单项选择题

It is human nature to think back to Golden Age ______ one's country was strong and respected.

A．when
B．provided
C．as
D．unless
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单项选择题
After having gone ______ far, George did not want to turn back.
A．enough
B．much
C．such
D．that
单项选择题
The young man assured the boss that he would ______ all his energies to do the job well.
A．call on
B．call forth
C．call at
D．call off
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