I have never seriously thought about it.这个句子的副词是什么

I have been so serious I have been so serious I have been working there for 15 years ,and never before___my boss so serious.A.I have foundB.have I found选哪个?为什么? I have a cold serious是什么意思 I never have any I never have any 造句：I have never . I have never I never have meetings. Never have I 英语单词填空 I have never seen her since her father fell sick of a serious i---最后一个空是填ill还是illness?为什么?我认为是ill, 英语选择题疑问1I have been working there for 15 years,and never before _____my boss so serious.A did I find B.have I found请解释为何选B不选A, I HAVE NEVER BEEN,能否说I never have been I have never been away! I HAVE NEVER SEEN 歌词 I have never baeak your mr wang is (serious) teacher that i have ever seen. Mr Morton is________________(serious))teacher that I have seen we are never together long enough to have a serious quarrel 如何准确的翻译