There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.

There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.

A．to which          B．in which           C．for which          D．on which

There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.

　　 A. to which　　　 B. in which　　　　 C. for which　 D. on which

There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.

　　 A. to which　　　 B. in which　　　　 C. for which　 D. on which

There is hardly an environment on earth ________ some species of animal or other have not adapted successfully．

1. A.
   to which
2. B.
   in which
3. C.
   for which
4. D.
   on which