几个月前,我们曾就……事给您写了一封信。
Some months ago we wrote you regarding... *regarding “关于……”。
就……事我们至今没有得到您的回音。
So far, we do not seem to have received word from you... *催促什么事情时。
如果在1998年12月1日前还得不到您的回音的话,……
If we do not hear from you by December 1, 1998...*语气有些严厉。
有关……事,我们还未收到您的任何回音。
So far, we have not received word from you... *so far “至今为止”。
So far, we have not received any word from you...