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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单项选择题
Alice __ my letter; otherwise she would have replied before now.
A．ought to have received
B．haven’t received
C．has been received
D．couldn’t have received
单项选择题
I wonder how long ago this school __
A．has begun
B．begins
C．began
D．has started
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