非常感感谢您的回信,我最近去参加了学校组织的社会实践活动,一直不在家,所以没有及时回复您的信件.对此我感到很抱歉.

Thank you very much for your reply,i have took part in the social practical activities organized by our schools recently and been out for a long time ,so that i cannot reply to you in time.And i fee...