MY WIFE AND I ……… TO MEXICO BY AIR LAST SUMMER A. TRAVELLED ...

21. - BAI TAP CAC THI TIENG ANH 60 DAP AN
BAI TAP CAC THI TIENG ANH 60 DAP AN

21. My wife and I ……… to Mexico by air last summer

a. travelled       b. had travelled          c. have travelled        d. have

been travelling