the man who lost the purse, Mike had to stay there longer.
A. Not finding
B. Not found
C. Not having found
D. Having not found
网友回答
A. Not finding
B. Not found
(答案→)C. Not having found
D. Having not found
解析：句意：没有找到丢钱包的人，Mike必须留在那里更长时间。动作find与其逻辑主语Mike之间是主动关系，故用现在分词作原因状语，现在分词的动作发生在谓语动词之前，故用现在分词的完成时，可知选C。