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
These excursions will give you an even deeper ______ into our language and culture.
A．inquiry
B．investigation
C．input
D．insight
单项选择题
The stock ______ in value should be sold.
A．which has not increased
B．has not increased
C．not been increasing
D．who has not increased
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