单项选择题


A.of
B.to
C.for
D.on
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单项选择题
A.ensuresB.providesC.grantsD.contributes
A.ensures
B.provides
C.grants
D.contributes
单项选择题
A.citizensB.graduatesC.teachersD.pupils
A.citizens
B.graduates
C.teachers
D.pupils
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