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
These excursions will give you an even deeper ______ into our language and culture.
A．inquiry
B．investigation
C．input
D．insight
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