单项选择题
A.by
B.with
C.at
D.about
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单项选择题
A.valuableB.significentC.commercialD.effective
A.valuable
B.significent
C.commercial
D.effective
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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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