If you already have health insurance，the only change ________ you'll see under my plan is lower premiums．

A.what                 B.which                C.why          D.不填

If you already have health insurance，the only change ______ you'll see under my plan is lower premiums．

1. A.
   what
2. B.
   which
3. C.
   why
4. D.
   不填