【题目】At one point I made up my mind to talk to Uncle Sam. Then I changed my mind, ______ that he could do nothing to help.
A. to realize
B. realized
C. realizing
D. being realized
在线课程【答案】C
【解析】句意：我一度下定决心和山姆叔叔交谈。然后，当意识到他不能帮忙时，我改变了主意。I 与realize之间是主动关系，因此要用realizing形式表示主动关系，故选C。