现在完成时的时间状语前用for还是用in
问题描述：
现在完成时的时间状语前用for还是用in
看到有用for的,有用in的,我感觉只能用for啊.具体应该是怎样?
这个句子对吗？
There have been great advances in medicine in the last ten years.
答
There have been great advances in medicine in the last ten years.
对的
如果是There have been great advances in medicine for ten years.就用FOR