为什么是since two years ago 而不是for two years ago
为什么是since two years ago 而不是for two years ago
英语人气：753 ℃时间：2019-12-07 20:44:57
优质解答
since 后加时刻,两年前是一个时刻,for后加时间段,所以不能加 two years ago ,只能说 for two years
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