YOU LOOKED VERY BUSY WHEN I SAW YOU LAST NIGHT. WHAT ____ YOU____

24. - File thứ 1: anh11new_231201916
File thứ 1: anh11new_231201916
24. You looked very busy when I saw you last night. What ____ you____?A. are ___ doing B. had ___ done C. were___ doing D. have___ done