Only after you have known someone for some time _____to appreciate his real worth.

       A．do begin you         B．you do begin         C．do you begin         D．begin you

Only after you have known someone for some time _________ to appreciate his real worth．

1. A.
   begin you
2. B.
   do you begin
3. C.
   you do begin
4. D.
   do begin you