英语翻译Mrs.Green gave her husband her letters to post when he w

英语翻译
Mrs.Green gave her husband her letters to post when he was going to work.But sometimes Mr.Green forgot to do so and kept them in his pocket for days.
One find morning in March,Mrs.Green asked him to post a letter."Please post this letter and don't forget,"she said.Mr.Green put the letter in his pocket and said,"I am sure to post this one."Mrs.Green smiled and said,"Yes,I believe that you will this time."Mre.Green looked at his back,and was still smiling when she closed the door.
Mr.Green walked slowly along the street.Soon a man came up from behind him.When he walked by,the man looked back and smiled,"Don't forget to post the letter!"
Then a girl walked by,and she turned and smiled,too."Don't forget to post that letter!"She said.
Mr.Green said to himself,"Why are these people smiling at me?And how do they know I have a letter to post?"
At last he came to a post office,posted the letter,and walked on.But after a while,a boy came up from behind him and asked him,"Did you post your letter?"
"Yes,I did,"said Mr.Green.
"Then I can take off his paper from the back of Mr.Green's coat and showed it to him.On the paper were these words-"Ask him to post the letter."
这篇文章看懂了,但是 有一题是：Mr.Green had his wife put the large piece of paper on his back.这道题是选F,那这句应该怎么翻?had在这里做的是什么成分,