incumbent [ɪnˈkʌmbənt] (fml) adjective to be incumbent (up)on sb to do sthg spettare a qn fare qc incumbent [ɪnˈkʌmbənt] (fml) noun [postholder] titolare mf
Complétez la séquence avec la proposition qui convient. I'm tired because I … all morning. have been working have working