---from her for a long time i decided to writeto her again having heard 为什么不能用
问题描述:
---from her for a long time i decided to writeto her again having heard 为什么不能用
having not heard
答
having heard from her..这相当于一个完成时句子,那么完成时句子否定是have not heard from her,
所以要用having not heard