第1个回答 2013-04-01
I promise/guarantee that we shall deliver our good/product on time.
第2个回答 2013-04-01
You have my promise that we can give a prompt delivery.
I can assure you that we can give a prompt delivery.
You have my guarantee that we can give a prompt delivery.
第3个回答 2013-04-05
I promise you we won't overdue.