题目内容：

I__(learn) english for more than three years可不可以填have learning?

优质解答

have been learning可以,
have learning不可以,有语法错误.

追问：

have learned和have been learning哪一个更恰当

追答：

have learned更常用一些。 have been learning也可以用，更多强调我现在依然在学习。 两句语义有些微妙差异。