高中英语问题----Has Nancy gone back to her home in the UK
高中英语问题----Has Nancy gone back to her home in the UK
——Has Nancy gone back to her home in the UK?
——yes.She _______ here only for three days with her friends.
A.stayed B.had stayed
为什么选A不选B? 过去完成时要什么时候用,能举个例子吗?