分类：教育/科学-学习帮助
问题：english97Havinglearned_______ski 
Having learn_______skillfully,she went on learning_________.A to skate   swimming     B skating     swimmingC to skate   to swim      D skating      to swim
回答：learn  doing  sth   
learn  to   do   sth 
的区别是前者表示已经完成了，就是学会了。
后者表示将要学，还没有学。
译文：她已经学溜冰的很有技术了，她将继续学习游泳。