单项选择题


A.on
B.for
C.upon
D.at
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单项选择题
A.scopeB.rangeC.fieldD.district
A.scope
B.range
C.field
D.district
单项选择题
A.situationB.circumstanceC.backgroundD.condition
A.situation
B.circumstance
C.background
D.condition
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