WHY ARE YOUR HANDS SO DIRTY

31. - File thứ 5: de_va_dap_an_45_phut_so_3_lop_11_sach_moi_311201817
File thứ 5: de_va_dap_an_45_phut_so_3_lop_11_sach_moi_311201817

31. Why are your hands so dirty? - I _______ my bike.

A. repaired B. has been repaired C. have repaired D. have been repaired