Question

She arrived when I______(have) a bath, so I couldn't answer the dolor!

#had.
#was having.
#has.

Answer 1

La respuesta es had porque estás hablando de ti mismo, por tanto no puedes usar ni has, porque es plural y el was having no queda, pues was significa era, y no puedes decir, yo era bañándome jaja

Answer 2

Respuesta:

She arrived when I____(have) a bath, so I couldn't answer the dolor!

La respuesta es ' was having '

espero te sirva