The meeting has been called off. has后为什么加been. 谢谢

The meeting has been _____ (结束)for 2 hours. The meeting has been called off. has后为什么加been. 谢谢 The meeting has been (提前)to eight o,clockThe meeting has been（ ）(提前)to eight o,clock翻译单词 The meeting ___when I got there.A has begun B has been on C had begun D had been on 见面会已经结束,英语怎么说?是the meeting has been over,还是the meeting is over. The meeting has been off for two hours.It______since_______.The meeting_________two hours ago. He is one of the students who（ ）invited to the meeting.A have been B Has beenC.Had been The meeting ______just for several minutes.A.has begunB.has startedC.has been on D.has been started请说清楚为什么选这个 When the meeting will be held has not been decided yet. The meeting has been on for fifteen minutes.改为同义句 The meeting has been put off by an hour.是被动语态? There is a n____ on the board saying that他和meeting has been put off. The meeting has been on since an hour ago原句如题 同意转换 请问：the meeting has been on for over ten mimutes.中为什么加ON? whether to go to the meeting or not has not been decided yet.翻译 When to hold the meeting has not been decided yet.我想知道been后面接 decided是什么意思 How long ____ the meeting ____?For about ten minutes.A.did; begin B.has; begun C.has; been on D.has; been Everyone except Tom and John -----there since the meeting began A.has been B.has gone为什么选A?