It is human beings who should be responsible _______ the harm done ____nature.

A. to, to       B. for, to      C. for, at      D. at, to

It is human beings who should be responsible _______ the harm done ____nature.

1. A.
   to, to
2. B.
   for, to
3. C.
   for, at
4. D.
   at, to

It is human beings who should be responsible _______ the harm done to nature．

A．to                        B．for                        C．with                      D．of