单项选择题

A．Problems with aircraft.
B．Problems with computers.
C．Too many passengers.
D．Too few pilots and passengers.
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单项选择题
A．To make a reservation.B．To check a reservation.C．To cancel a reservation.D．To change a reservation.
A．To make a reservation.
B．To check a reservation.
C．To cancel a reservation.
D．To change a reservation.
单项选择题
A．The man’s illness.B．The effect of antibiotics.C．The hobby of the woman’s mother.D．Their class.
A．The man’s illness.
B．The effect of antibiotics.
C．The hobby of the woman’s mother.
D．Their class.
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