If I had worked harder at school, I ___ in a comfortable office now.

1. A.
   would have sat
2. B.
   had sat
3. C.
   would be sitting
4. D.
   could sit

 If I had worked harder at school, I ___ in a comfortable office now.

   A.would have sat           B.had sat              C.would be sitting               D.could sit

If I had worked harder at school, I         in a comfortable office now．

       A．would sit  B．would have sat C．would be sitting       D．were sitting

If I had worked harder at school, I         in a comfortable office now．

       A．would sit  B．would have sat C．would be sitting       D．were sitting

If I had worked harder at school, I         in a comfortable office now．

A．would sit      B．would have sat     C．would be sitting       D．were sitting