单项选择题

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

A．unless
B．provided
C．as
D．when
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单项选择题
The police accused him of setting fire to the building but he denied ______ in the area on the night of the fire.
A．to be
B．to have been
C．having been
D．be
单项选择题
If businessmen are taxed too much, they will no longer be motivated to work hard, with the result that incomes from taxation might actually ______.
A．shrink
B．delay
C．disperse
D．sink
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