how long since i bumped into you and your sister at McDonald?选项：A is it B was it C had it been D has it been it is +加一段时间 since 与 it has +加一段时间 since 不是意思一样吗?我很混,请问此题该作何解？

since when ,how long 区别 bum How long is it_____ I _____?A.since…arrivedB.since…has arrivedC.when…arrivedD.as…arrived 英语翻译“how long it has been since i have done something 最好结合情景举个例 how long has it been since I have seen one!是感叹句吗 ---How long ___ you ___(live) in Beijing?---Since I was ___(bear). 'How long can I How long was it be,since i held you near?How long will it be,till i have you right here?小弟英语不好, I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问? Bum,Bum,Bum 歌词 I can’t say _______ I want to see you again.It’s a year since I last saw you.A.how long B.how答案为什么是C,怎样翻译I can’t say _______ I want to see you again.It’s a year since I last saw you.A.how long B.how often C.how much D.how 八年级下册英语书语法：How long have you been skating?I've been skating since nine o'clock. how long have you been _Beijing-Opera?-for ten years.-_did you _performing -since i was five 岁 --- How long have you been collecting coins?--- ________.A.Since 5 years ago B.Since 5 years C.C.In 5 years D.When I was 5 I cann't say__I want to visit my grandma.It is a long time since we met lastA .how often B.how soon C.how long D.how much how long will I wait How long I can hold for、since、how long 有何共同用法