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
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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
单项选择题
You oughtn't to have been there, ______
A．hadn't you
B．didn't you
C．oughtn't you
D．ought you
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