─ Mary,who ------- you ------- on the phone?─ It’s my best f

─ Mary,who _______ you _______ on the phone?─ It’s my best friend,Ann.( )28.─ Mary,who _______ you _______ on the phone?─ It’s my best friend,Ann.A.are; talking B.are; talk with C.are; talking with D.do; talk about