单项选择题

A．unknown reasons.
B．a training flight.
C．the training formation.
D．four bombs.
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单项选择题
A．were allowed to work unimpeded.B．were forbidden to work at all.C．were asked to leave.D．were promptly detained.
A．were allowed to work unimpeded.
B．were forbidden to work at all.
C．were asked to leave.
D．were promptly detained.
填空题
isolation
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