单项选择题

The manager needs an assistant who he can ______ to take care of problems in his absence.

A．count on
B．count in
C．count up
D．count out
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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
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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