很遗憾的告诉你,我的毕业证书已于三年前丢失,因此我无法用任何方法证明我的学历.
我想你应该通知你的上司,看他们是否能够接受.请及时把结果通知我.谢谢!
I am so regret to inform you that my diploma have been lose three years ago,So that I can't prove my qualification with(by?) any other ways.
you should notice this to your boss as well as let me know whether they could accept this or not.
这是自己翻译的,有什么问题呢?