7.The bell for class rang.The students stopped to sing and got ready for the lesson.to sing 错了 应该改成什么 为什么~
问题描述：
7.The bell for class rang.The students stopped to sing and got ready for the lesson.to sing 错了 应该改成什么 为什么~
答
---------.The bell for class rang.The students stopped singing and got ready for the lesson.--------学生不再唱歌并且准备上课.1 stop to sing ------开始唱歌2 stop singing------不再唱歌...