Who has been to Washington D.C.?

Has Ann been to Washington D.C.?

Has Ann been to Washington D.C. or to New York?

Where has Ann been?

Ann has been to Washington D.C., hasn't she?

Я d.c. не случайно написала, у вас ошибка была.

 Ann has been to Washington DC

1 Has Ann been to Washington DC/

2 Ann has been to Washington DC, hasn't she?

3 Has Ann been in Washington DC or to London?

4 Where has been Ann?

5 Who has been to Washington DC?