英语现在完成时 How long has the film been on?为什么要用on?

英语现在完成时 How long has the film been on?为什么要用on? -How long has the film been on?-___3:30.A.At B.About C.Befor How long has the hous been on fire 空 has the film been on.Ahow long Bhow often Ch 4题英语,帮个忙,1.The film has been on for twenty minutes.(用begin改为 英语现在完成时stop可延续吗 stop可延续吗the bus has been on the road .为什么不能h The film( )(begin)since two o'clock.has been on,为什么?不应该是"has Has the new color film been shown this year?为什么用现在完成时的被动语态? How long has the movie been on It ___ five minutes _____. The film has been on for five minutes是什么意思 the film has been on for fifteen minutes How long __ you __(从事)the project?为什么答案是have,been working on