单项选择题

A．To tell him they are busy.
B．To cancel an appointment.
C．To send him a busy signal.
D．To invite him to go to a film.
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单项选择题
A．They are useful and practical.B．They are of great importance.C．They are imaginative and personal.D．They are fashioned and quick to arrive.
A．They are useful and practical.
B．They are of great importance.
C．They are imaginative and personal.
D．They are fashioned and quick to arrive.
单项选择题
A．Hardly ever looked into the causes of tragedies.B．Imposed safety rules as soon as accidents took place.C．Seldom introduced safety laws before disasters occurred.D．Paid much attention to the results of scientific discoveries.
A．Hardly ever looked into the causes of tragedies.
B．Imposed safety rules as soon as accidents took place.
C．Seldom introduced safety laws before disasters occurred.
D．Paid much attention to the results of scientific discoveries.
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