英语-请问这两句话有区别吗?

题目

英语-请问这两句话有区别吗?
i have specialized in teaching math for five years.
i have been specialized in teaching math for five years.

答案

其实没有什么区别,只不过第二句通常不这么说.
比较常见的是第一句,如果非要使用句型二,可以这么说：
I have been specializing in teaching math for five years.
意思如果非要细分,同Iorihaha所述.