I'm expecting a pet dog for long，but mom has no time to buy _________ for me．

      A．it                        B．one                     C．this                     D．that

I'm expecting a pet dog for long，but mom has no time to buy _________ for me．

I'm expecting a pet dog for long，but mom has no time to buy _________ for me．

1. A.
   it
2. B.
   one
3. C.
   this
4. D.
   that