Snakes won’t do you any harm _____ you keep away from them.

  A. as long as       B. even if            C. as far as                     D. in case that

Snakes won’t do you any harm _________ you keep away from them．

1. A.
   as long as
2. B.
   even if
3. C.
   as far as
4. D.
   in case that