单项选择题

A．When they’re unable to control the person’s behavior.
B．When the causes of the behavior are obvious.
C．When the consequences of the behavior are unpleasant.
D．When the behavior is expected.
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单项选择题
A．To be a mathematician.B．To write his own books.C．To teach in high school.D．To be a medical doctor.
A．To be a mathematician.
B．To write his own books.
C．To teach in high school.
D．To be a medical doctor.
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