這道題本身就有問題.正確的有下面幾種：
She has eaten it since ten minutes ago.自從十分鐘前,她就已經(jīng)吃了.
She has eaten it for ten minutes.她已經(jīng)吃了十分鐘了.
She ate it ten minutes ago.十分鐘前她吃了.
注意：for和ago不能同時用