单项选择题

A．7 and half hours.
B．10hour.
C．8 and half hours.
D．8 hours.
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单项选择题
A．He is a college professor.B．He is in the a computer company.C．He is in the advertising business.D．He is a computer specialist.
A．He is a college professor.
B．He is in the a computer company.
C．He is in the advertising business.
D．He is a computer specialist.
单项选择题
A．Colleagues.B．Mother and son.C．A teacher and a student.D．A prospective employer and an employee.
A．Colleagues.
B．Mother and son.
C．A teacher and a student.
D．A prospective employer and an employee.
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