单项选择题A.stop to eatB.stop eatingC.stop to be eatingD.stop not to eat
单项选择题A.fruitB.fruitfulC.failureD.fruitless
单项选择题A.marksB.traceC.symbolsD.signs
单项选择题A.afterB.untilC.inD.within
单项选择题A.inB.ofC.forD.to