I ________ to bed when the telephone rang：it was my aunt Lucy who was at the airport．

1. A.
   went
2. B.
   would go
3. C.
   had gone
4. D.
   was about to go

I ____ go to bed ____ the telephone rang.

 I ____ go to bed ____ the telephone rang.

   A. was about to, when                           B. was going to, while

   C. would, when                                 D. was to, while

I ____ go to bed ____ the telephone rang．

   A．was about to, when   B．was going to, while   C．would, when    D．was to, while