I___for a long time.A.haven‘t sung B.haven’t sing C.sang D.had sung

I___for a long time.A.haven‘t sung B.haven’t sing C.sang D.had sung long time和a long time区别? A long time 请求, a long time-scale a long time a long lonely time A long time ago a long time A long long time ago 歌词 what a long time. 是什么意思?就是What a long time. a long time going是什么意思? A Long Time Ago 歌词 ten minutes a long time a long time 区别 long time.求它们的区别. we waited a long time for the bus为什么是a long time 而不是long time the long time We have been waiting here a long time for the guest.句中a long time 做什么成分?能用long time,the long time,some long time a long time ago 、long long ago、once和once upon a time的区别 A GOOD TASK TAKES A LONG TIME