The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.

A. who      B. when      C. on which            D. which

The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

A.who                          B.when                        C.on which                   D.which

The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

A.who                B.when                       C.on which                          D.Which

The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

A.who　　　　　 B.when　　　　　 C.on which　　　 D.which

The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.

1. A.
   who
2. B.
   when
3. C.
   on which
4. D.
   which