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
We' re late and the play has started. I wonder how long ago______.
A．did it begin
B．it began
C．was it beginning
D．it has begun
单项选择题
Although he thought he was helping us to prepare the dinner, he was actually______ the way.
A．in
B．off
C．by
D．on
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