write to sb

请问下面一句填什么介词？为何？

As soon as possible, write to me ______ the above address.

address 作“地址”解，前面习惯上用介词 at 。比如：

I have written to her at her new address. 我已写信寄到她的新地址。（摘自《薄冰英语惯使用方法词典》）

Are you still at the same address? 你还是在原来的那个地址吗？（摘自《牛津英语使用方法指南》第三版）

所以，你的句子应该是：As soon as possible, write to me at the above address.