Sincerely yours 
你的真挚的;您忠诚的;谨致问候
- How did you sign the letter? Did you write sincerely yours?
你在信上怎样署名的?你写了“您最真诚的朋友”吗? - How did you sign the letter? Did you write "sincerely yours"?
你在信上怎样署名的?你写了“你诚挚的”吗? - How did you sign the letter? Did you write, "Sincerely yours"?
你在信上是怎么署名的?你写上“忠于您的”了吗?
sincerely yours[ adv ]
written formula for ending a letter
<adv.all>