到上学期末，我们已经学会了20首英语歌。
By the end of last term, we had already learned 20 new Englisjh songs.
到上学期末，我们已学习了《新概念英语》第二册的大部分课程。
By the end of last term we had been learning most of the lessons of New Concept English, Book2.
到上学期末，我们已学习了《新概念英语》第二册的大部分课程。
By the end of last term we had been learning most of the lessons of New Concept English, Book2.
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