－－What do you think has made Tom so excited?
－－ a prize in a lottery.
A. Winning
B. Won
C. He won
D. To win
网友回答
(答案→)A. Winning
B. Won
C. He won
D. To win
解析：本题考查非谓语动词。根据问句What do you think has made Tom so excited?回答应当为Winning a prize in a lottery has made Tom so excited.故动名词短语作主语，选A。