Elige la respuesta correcta.
1 de 10 We have been working ____ 8 o'clock this morning.2 de 10 They played football ____ three hours yesterday afternoon.3 de 10 Neil has been sleeping ____ hours.4 de 10 I learned to drive fifteen years ____.5 de 10 The children have been studying ____ this morning.6 de 10 My parents went to New York City two years ____.7 de 10 I have been tired ____ last week.8 de 10 She always talks on the phone ____ hours with her sister.9 de 10 We have been attending the annual conference every year ____ 2005.10 de 10 He has taught English at the academy ____ 8 years now. 
