“Oneday,Saanuwouldliketoplayagameoutside,droppedtheballawayandthensnatchingitback.”这是个改错题,这里的dropped我给改成了“dropping”以前碰到这种类型的题,老师都说看到逗号后面有动词就用Ving形式.我感觉他说的很牵强额.还有,我这没改错吧?