Until recently中until是什么词性?

Until recently中until是什么词性? Until fairly recently until recently这个recently是修饰until吗? 请问 until recently 如题 until until until until until recently+过去时还是完成时? Not until recently和until recently的区别和用法是什么? until after exam中until是什么词 英语 介词后可接副词吗?比如说until recently until...和not until... 为什么这个句子用until不用when 并翻译until recently,Anna worked as a teacher in Japan. until ( ),I know him to have diedA.recent B.recently 说出原因until是连词还是介词? Until comparatively recently.对应中文应该怎么说呢?原文:Until compartively recently the opportunities for criminal activity on the Internet have been low. until recently后面的接个句子用什么时态,为什么? Until recently scientists would have disapproved of such an idea.啥意思?