The file began fifteen minutes ago.

来源:百度知道 编辑:UC知道 时间:2024/05/30 06:29:02
同意句

The file has been on for fifteen minutes.

The file was on fifteen minutes ago.
(个人认为应该用过去时,因为现在完成时强调的是对现在的影响,其中been on有一直延续之意,但题目中只给了一个提示词"ago",证明file在此时此刻可能已经结束,用过去时更准确.)