单项选择题

A．is
B．was
C．has been
D．is being
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单项选择题
A．should gradually increaseB．gradually increaseC．gradually increasedD．has gradually increased
A．should gradually increase
B．gradually increase
C．gradually increased
D．has gradually increased
单项选择题
A．a necessityB．necessitiesC．necessarilyD．necessity
A．a necessity
B．necessities
C．necessarily
D．necessity
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