单项选择题

______ was once regarded as impossible has now become a reality.

A．That
B．Which
C．Who
D．What
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单项选择题
You’ll have to pay for the holiday in ______ ，Tom．
A．front
B．advance
C．ahead
D．forward
单项选择题
I never expected you to ______ at the meeting．I thought you were abroad.
A．turn on
B．turn down
C．turn off
D．turn up
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