Only in recent years _________ begun to realize that wild dogs,

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 have
C、have people
D、people who have
【正确答案】：C
【题目解析】：这题考查倒装句的用法：only+介词短语，位于句首时，句子要部分倒装，即将be动词，情态动词，助动词放在主语前面，选C。