I am disappointed with my neighbor.she said she would keep her cat off my grass,but sheA didn't B hasn't答案是B 为什么? 说下原因

I am disappointed with my neighbor.she said she would keep her cat off my grass,but she
A didn't B hasn't
答案是B 为什么? 说下原因

因为她到现在为止还没有CUT OFF MY GRASS 所以前文用AM 所以后文用现在完成时

完成时,是说到现在为止,还没有做