... THIS WORK ... BEFORE YOU WENT TO MOSCOW

20. - BAI TAP TIENG ANH CHUYEN DE CAU BI DONG CO DAP AN
BAI TAP TIENG ANH CHUYEN DE CAU BI DONG CO DAP AN
20. ... this work ... before you went to Moscow? A. Will/ have been done B. Has/ been done C. Will/ be done D. Had/ been done