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A．He should have made an appointment.
B．He should have called to cancel his appointment.
C．He should have come for his appointment.
D．He should have stayed at home until he was well.
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A．It tries to categorize the different kinds of sharks throughout the world.B．It tries to warn humans of the dangers posed by sharks.C．It tries to describe the characteristics of shark teeth.D．It tries to clear up misconceptions about sharks.
A．It tries to categorize the different kinds of sharks throughout the world.
B．It tries to warn humans of the dangers posed by sharks.
C．It tries to describe the characteristics of shark teeth.
D．It tries to clear up misconceptions about sharks.
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