单项选择题

The company ______ its sales by an average of 10% per year since its establishment in 1993.

A．increases
B．increased
C．is increasing
D．has increased
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Only by adopting more creative approaches ______ to overcome present-day challenges.
A．we can hope
B．can we hope
C．hope we can
D．can hope we
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The flight scheduled ______ at 9 a. m. was delayed four hours due to the bad weather.

A．to take off
B．take off
C．taking off
D．to be taken off
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