Without electronic computers ,much of today’s advanced technology          .

       A．will not have been achieved    B．have not been achieved

       C．would not have been achieved D．had not been achieved

Without electronic computers, much of today’s advanced technology ________．

1. A.
   will not have been achieved
2. B.
   have not been achieved
3. C.
   would not have been achieved
4. D.
   had not been achieved