title: What keys should I press to activate c_CTRL-D in vim?
body: <p>I don't get how to activate this key c_CTRL-D in vim . I saw the  document and understood the function of this operator_motion combination. But I don't see the way how to trigger it. Pressing button 
  C and then CTRL + D but it doesn't seem to work.</p>
  
  <p>Thanks everybody.</p>