BEFORE HE TURNED 14, MOZART ……….A FEW LESSER PIECE FOR THE PIANO.A...

14. - DE KIEM TRA 1 TIET LAN 2
DE KIEM TRA 1 TIET LAN 2
14. Before he turned 14, Mozart ……….a few lesser piece for the piano.A has composed B had composed C was composed D would composedChoose the underlined word or phrase in each sentence that needs correcting.