THEY SPOKE ___________________FOR US TO UNDERSTAND

15. - DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
Tiếng Anh DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
15. They spoke ___________________for us to understand.A. quick enough B. so quickly C. quickly so D. quickly enough