经典句型:What happened? 发上了什么事? A:What happened? 甲:发上了什么事? B:I don't know. 乙:我不知道。 A:Let's stop and have a look. 甲:我们停下来去看看吧。 B:Don't waste time. 乙:别浪费时间了。 A:I'm curious...