单项选择题

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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单项选择题
A．They didn’t watch the end of the race.B．Only three of them didn’t finish the raceC．Most of them didn’t run.D．They participated in the last three races.
A．They didn’t watch the end of the race.
B．Only three of them didn’t finish the race
C．Most of them didn’t run.
D．They participated in the last three races.
单项选择题
A．To move the muscles.B．To carry different messages.C．To protect the nerves.D．To control nerve cells.
A．To move the muscles.
B．To carry different messages.
C．To protect the nerves.
D．To control nerve cells.
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