单项选择题

The number of the employees ______ in this company.

A．have doubled
B．has doubled
C．are doubled
D．were doubled
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单项选择题
All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
A．had been canceled
B．have been canceled
C．were canceled
D．having been canceled
单项选择题
People appreciate ______ with him because he has a good sense of humor.
A．to work
B．to have worked
C．working
D．having worked
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