单项选择题


A.on
B.to
C.of
D.in
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单项选择题
A.gatheredB.collectedC.assembledD.accumulated
A.gathered
B.collected
C.assembled
D.accumulated
单项选择题
A.dutyB.responsibilityC.obligationD.mission
A.duty
B.responsibility
C.obligation
D.mission
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