学帮网We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/30 11:18:46
We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]
How long have you heard from David since he leave shanghai?