单项选择题

A．Husband and wife.
B．Doctor and patient.
C．Teacher and student.
D．Customer and shopkeeper.
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单项选择题
A．85.B．90.C．93.D．97.
A．85.
B．90.
C．93.
D．97.
单项选择题
A．Mechanic problems.B．The weather.C．The fact that the crew is not ready.D．The fact that the flight is overbooked.
A．Mechanic problems.
B．The weather.
C．The fact that the crew is not ready.
D．The fact that the flight is overbooked.
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