Simplest:

来源: 于 2013-10-09 09:14:27 [旧帖] [给我悄悄话] 本文已被阅读：次

I'd rather not answer that question.  Is it OK?
It is not a legitimate intervewing question.  And it really doesn't help them even if you answer.  With this answer, they would guess that you have but won't contued ask you to confirm.