Everyone has his or her advantages, and only you do best can help to reach the goal and truly make a difference.
A. discovering what
B. discovering whose
C. by discovering what
D. by discovering which
网友回答
(答案→)A. discovering what
B. discovering whose
C. by discovering what
D. by discovering which
解析：discovering what...动名词短语作主语，what引导宾语从句又在从句中作宾语。