JOHN SPEAKS ENGLISH VERY QUICKLY , ……….A. SO IT IS DIFFICULT TO UND...

6. - DE KIEM TRA ANH 9
DE KIEM TRA ANH 9
6. John speaks English very quickly , ……….A. so it is difficult to understand him . B. because it is difficult to understand him .C. but it is difficult to understand him . D. if it is difficult to understand him .