单项选择题

A．
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单项选择题
A．Half an hour.B．One hour.C．One hour and a half.
A．Half an hour.
B．One hour.
C．One hour and a half.
单项选择题
A．They are doctors.B．They are students.C．They are workers.
A．They are doctors.
B．They are students.
C．They are workers.
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