键入

fg

然后敲击回车 ;D

   fg [jobspec]
      Resume jobspec in the foreground, and make
      it  the  current  job.   If jobspec is not
      present, the shell’s notion of the current
      job  is used.  The return value is that of
      the command placed into the foreground, or
      failure  if  run  when job control is dis-
      abled  or,  when  run  with  job   control
      enabled,  if  jobspec  does  not specify a
      valid job or jobspec specifies a job  that
      was started without job control.