英语求助Has it been announced when the planes are to take off求句子成分分析

英语求助Has it been announced when the planes are to take off求句子成分分析 it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed 紧急求助英语,How long has this shopHow long has this shop________________?A.been open B.been opened请问大侠们选那个答案,请给出原因. 英语 完成时It has been raining for three hours.为什么要加been?加been不是表被动么? 英语中have been；has been是什么? 英语,has been和 had been 英语：为什么填has been it's always been you(It has always been it has been可以缩写成it's been it's been.的全称是不是 it has been... 英语它已经树立在那里100多年了是it has been standing here for 100 years还是it has been stood here? 英语Has been to 和Has been in 怎么用? 这句英语怎么翻译it has so far of necessity been largely of empirical nature. It has been made into a film turned out to be a success是什么意思?英语