Thestudents______busilywhenMissBrownwenttogetabookshe______intheoffice. A: werewriting;hasleft B: hadwritten;left C: werewriting;hadleft D: hadwritten;hadleft

Isuggesthe____atonce A: leave B: leaving C: left D: hadleft

Thelasttrain________thestationat11:30. A: hasleft B: leaves C: hadleft D: wouldleave

Ithas been fouryearssinceJohn________school. A: hasleft B: hadleft C: left D: wasleft