一般地说

来源: 于 2008-05-11 16:47:33 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

there's no legal obligation whatsoever. if there are certain obligations, your friend should know already. if TA does not know any, then chances are there's none.

this is a free country. we all live for ourselves.