如果你已经收到学校的录取通知了，再拒也不迟。一般学校会让你在一定时间里交订金，过期视为放弃。

言简zhidao意赅就行，版下文仅供参考：权Dear SirI feel so regret to write this letter to you because I choose another university as my target school after careful considerations, so I have to decline your offer . Even though, I still thank all your appreciation and encouragement on me, which will also inspire me to pursue my dream.