HE STARTED LEARNING ENGLISH WHEN HE WAS 11 YEARS OLD . HE START...

15. - KIEM TRA 1 TIET AV 10 15. - KIEM TRA 1 TIET AV 10
KIEM TRA 1 TIET AV 10
15. He started learning English when he was 11 years old .A. He has been learning English when he was 11 years old .B. He has been learing English since he has been 11 years old .C. He has been learing English since he was 11 years old .D. He has been learing English for he was 11 years old .