Little as he is, Tom, like his parents, ________ others who are in need．

1. A.
   is always helping
2. B.
   has always helped
3. C.
   are always helping
4. D.
   have always helped

 Little as he is, Tom, like his parents, ______ others who are in need．

       A．are always helping                               B．has always helped

       C．is always helping                             D．have always helped