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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