单项选择题
A.by
B.with
C.at
D.about
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单项选择题
A.onB.atC.inD.under
A.on
B.at
C.in
D.under
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单项选择题
A.efficiencyB.energyC.timeD.money
A.efficiency
B.energy
C.time
D.money
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A.onB.throughC.withD.of