问题描述：
问下这两个英语句子之间的差别
1.I was about to leave when suddenly the telephone rang.
2.I was about to leave when suudenly the telephone was ringing
1.I was about to leave when suddenly the telephone rang.
2.I was about to leave when suudenly the telephone was ringing
问题解答：
我来补答展开全文阅读