They often chatted about the hard times______they spent together in the old days.

They often chatted about the hard times______they spent together in the old days.

1. A.
   where
2. B.
   when
3. C.
   which
4. D.
   what

They often chatted about the hard times______they spent together in the old days.

         A．where                           B．when                             C．which                            D．what

They often chatted about the hard times______they spent together in the old days.