单项选择题

A．Teachers and students.
B．Managers and doctors.
C．White collar workers and students.
D．Businessmen and clerks.
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单项选择题
A．Tomorrow.B．This evening.C．Next week.D．Tonight.
A．Tomorrow.
B．This evening.
C．Next week.
D．Tonight.
单项选择题
A．In the 12th century.B．By the 18th century.C．In 1451.D．In 1870.
A．In the 12th century.
B．By the 18th century.
C．In 1451.
D．In 1870.
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