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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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
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
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