Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

1. A.
   people have
2. B.
   since people have
3. C.
   have people
4. D.
   people who have

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

A. people have B. since people haveC. have people D. people who have

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.