Noone has _____ been able to trace the author of the poem.A. still B. yet C. already D. just

Noone has _____ been able to trace the author of the poem.A. still B. yet C. already D. just She has been teaching math for six years的同义句She has been teaching math _____ _____ _____ _____. He _____ his hometown for many years .( A has been away B has been away from) The meeting has been _____ (结束)for 2 hours. A study has been _____ recently .这个空填什么? The famous scientist has been _____(death)for five years. Yang Liwei has been into space 用into space 提问 _____ _____ Yang li wei _____? The cake has been eaten by them对them提问_____ _____the cake_____ _____ _____. He has been to beijing.I have been to beijing,too.合成一句He has been to beijing,_____ _____ _____. 会议已经持续四个半小时了（翻译） The meering has been on _____ ____ _____ _____ _____ _____ Look at the boy over there.Where _____ he _____ these days?A.has;gone to B.has;been to C.has;gone D.has;been - Who has been to Hawaii?- _____ has.A.No one- Who has been to Hawaii?- _____ has.A.No one B.I C.All of us D.None He has been skating since.的同义句He has been skating_____ _____ _____He has been skating since two hours ago.的同义句He has been skating_____ _____ _____ His grandfather has _____ for ten years.A diedB die C been deadD been death has been He has never been to New York.I have never been there,either.(同义句)He has never been to New York._____ _____ I. his health _____ a lot over the past decade.为什么空格用has been improving 而不是 has been improved Mike has been to London twice.(对twice进行提问) ____ _____ times has Mike been to London?