I was very sorry that I d______the article I wrote for three hours by mistakeI was very sorry that I d______the article I wrote for three hours by mistak.

I was very sorry that I d______the article I wrote for three hours by mistake
I was very sorry that I d______the article I wrote for three hours by mistak.

这个空填 deleted （删除）,
I was very sorry that I deleted the article I wrote for three hours by mistake.
我非常后悔我不小心删掉我花了三个小时写的文章.