单项选择题A.wereB.areC.usedD.had been
单项选择题A.sightB.imageC.appearanceD.perception
单项选择题A.takeB.doC.keepD.go
单项选择题A.advantageB.profitC.useD.charge
单项选择题A.exceptB.except forC.onlyD.only for