感恩节活动邀请函通知:__ three years ago.A,since B,for C,about

来源：百度文库 编辑：高考问答 时间：2024/05/11 14:12:51

Since three years ago 用于完成时
about three years ago 用于过去式

C 大约

似乎只有A能跟……ago

有下文吗？

C因为AGO不能拥在完成时态中
只能用于简单过去时态

__ three years ago.A,since B,for C,about We________(teachers)three years ago I first met Mary three years ago when we( ) in a middle school together. He has been away from China( )three years ago A HUNDRED YEARS AGO这个表达对吗？ Lily with her parents has been in the Greener China since three years ago. NewYork has a short history of some three hundered years. shall remain effective for a period of three years Eygpt 1000 years ago Anumber of years ago