问题描述:
she has been dead for three years.解释下been的作用.我知道是现在完成时,但不明白为什么要加been.
如果不加been 直接写成she has deaded for three years.
如果不加been 直接写成she has deaded for three years.
问题解答:
我来补答展开全文阅读