SHE DIDN’T KNOW HOW ……….A. USING B. USED C. USES D. TO USE

46. - DE THI THU DAI HOC MON TIENG ANH VA DAP AN
DE THI THU DAI HOC MON TIENG ANH VA DAP AN

46. She didn’t know how ……….

a. using

b. used

c. uses

d. to use