问题描述：
he left home last year and I have never seen him since这句话语法对不
句子改错：错句he left home last year and I did not see him since.改正后成he left home last year and I have never seen him since.请高手指教,
句子改错：错句he left home last year and I did not see him since.改正后成he left home last year and I have never seen him since.请高手指教,
问题解答：
我来补答展开全文阅读