－－What do you think has made Tom so excited?－－ a prize in a lottery.A. Winning B. Won C.

问题补充：

－－What do you think has made Tom so excited?

－－ a prize in a lottery.

A. Winning

B. Won

C. He won

D. To win

答案：

(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。