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

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