你可以说 for three years,但加上ago,就是since
时间可以分为点和线,加上ago,就是点,三年前
没有ago就是线,可以用for ,表示持续一段时间
she has't seen his family___three years ago.中为什么填since而不填before,from,for.要为什么哦!
she has't seen his family___three years ago.中为什么填since而不填before,from,for.要为什么哦!
英语人气：707 ℃时间：2019-11-04 11:25:42
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