【C20】A．instructiveB．efficientC．beneficialD．profitable

【C8】A．sufficientB．efficientC．effectiveD．sufficiency

【C8】A．effectiveB．efficientC．affectionateD．moved

The money I have saved is ____ for buying a car.A.proficientB.efficientC.potentialD.suff

He is an ____ manager.A.proficientB.efficientC.potentialD.sufficient

【C3】A．proficientB．efficientC．sufficientD．elaborate

国际法的官方编纂始于（)。A.19世纪B.18世纪C20世纪D17世纪