作业帮英语：用before和ago填空（简单说明理由）They came here___ May Day and Imet them three days___.She left 30 minutes____.I have never been to Shanghai____.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/03 06:57:25
英语：用before和ago填空（简单说明理由）They came here___ May Day and Imet them three days___.She left 30 minutes____.I have never been to Shanghai____.
英语：用before和ago填空（简单说明理由）
They came here___ May Day and Imet them three days___.
She left 30 minutes____.
I have never been to Shanghai____.
英语：用before和ago填空（简单说明理由）They came here___ May Day and Imet them three days___.She left 30 minutes____.I have never been to Shanghai____.
before 作为介词‘ 在……之前’,作为副词‘ 以前’ 与现在完成时连用
ago 常与一段时间连用‘ ……前’ ,如three days ago 三天前,与一般过去时连用.
所以答案分别是
1 before ,ago
2 ago
3 before
before ago ago before 采纳哦
before ago(before放在时间前，ago放在时间后)
ago（同上，这里省略了介词at,原句应为 she left at 30 minutes ago）
before(这里当 之前 的意思讲 我之前从未去过上海。)
before ago ago before“时间段 + ago”，表示从说话时刻算起的若干时间以前，常用于一般过去时。before可作介词，后接时间点；也可作连词，引导时间状语从句。而ago不能用作介词和连词。