Here is a letter It's from one of my pen-friends .合并成一句
问题描述:
Here is a letter It's from one of my pen-friends .合并成一句
答
It's a letter from one of my pen-friends
答
Here is a letter that/which is from one of my pen-friends
答
Here is a letter that is from one of my pen-friends
答
Here is a letter from one of my pen-friends