While Helen ________ the piano，her mother came in．

While I ________to the programs, my mother ________outside.

A. listened; was washing????????????? ????? B. was listening; washed

C. was listening; was washing????????????? ? D. was listening; is washing

While Helen ________ the piano，her mother came in．

A．was playing        B．is playing          C．played            D．plays

While my mother________ some washing, I was making  a kite for Mary.