A. HAVE THE LETTERS BEEN TYPED B. HAVE BEEN THE LETTERS TYPEDC. HAVE T...

15. - BAI TAP ON THI THEO CHU DE +DAP AN
BAI TAP ON THI THEO CHU DE +DAP AN

15. ...yet?

A. Have the letters been typed B. Have been the letters typed

C. Have the letters typed D. Had the letters typed