动词：助动词ought和had better－在线英语听力室...
Adam: Do you know how to swim? Eva : No, I don't. Adam: You ought to learn. Eva : Why? Adam: Well, maybe you'll have to save me one day. 你应当学习游泳 亚当：你知道怎么游泳吗? 夏娃：不，我不知道。 亚当：你应当学习。...
