单项选择题

A．Colleagues.
B．Dentist and patient.
C．Boss and secretary.
D．Teacher and student.
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单项选择题
A．For boat racing.B．For renting.C．For speed competition.D．For the season.
A．For boat racing.
B．For renting.
C．For speed competition.
D．For the season.
单项选择题
A．In summer.B．In autumn.C．In early winter.D．In late summer.
A．In summer.
B．In autumn.
C．In early winter.
D．In late summer.
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