she is not coming tonight.but she promised.可不可以是是have promised
问题描述：
she is not coming tonight.but she promised.可不可以是是have promised
答
这个要根据语义和语境来看,这里用到but应该是强调她当时许诺的那个状态.所以用了promised.
has promised在语法上没有错误.