单项选择题

A．They’re extremely noisy.
B．They should have arrived by now.
C．They should be allowed to fly there.
D．They are not on a definite schedule.
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单项选择题
A．Go to the library.B．Check her calendar.C．Attend the performance.D．Get some exercise.
A．Go to the library.
B．Check her calendar.
C．Attend the performance.
D．Get some exercise.
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