单项选择题

It is high time we ______.

A．leave
B．left
C．will leave
D．have left
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单项选择题
______ makes men different from the other animals is that they can think and speak.
A．That
B．The thing
C．All
D．What
单项选择题
Dr. Smith, together with his wife and two sons, ______ to arrive on the evening flight.
A．are
B．are going
C．is
D．will be
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