我记得帖子里哪个帖子可能说过。。。你找找看吧。。。
貌似是
Dear Sir/Madam,
It is my pleasure that having a chance to study at your university. You are my first choice. But I am afraid I cannot give you my definite decision at this time, because it is so early that my applications for other universities are under review. ..
Can you give me a few more days to consider it seriously after March 3 ? Thank you!