TODAY, MOST OF THE WORK ON THE FARM ______ BY MACHINES.A. IS DONE...

20. - DE KIEM TRA DINH KI
DE KIEM TRA DINH KI
20. Today, most of the work on the farm ______ by machines.A. is done B. is doing C. did D. doII. Choose from the four given options (marked A, B, C or D) the one that needs correcting to make the givensentence meaningfully and grammatically correct.