All his friends’ encouragement his confidence in winning the game.
A. added up to
B. added up
C. added to
D. added
网友回答
A. added up to
B. added up
(答案→)C. added to
D. added
解析：考查短语辨析。added up to 总计为，added up 加起来，added to 增加，句意：所有他朋友的鼓励增加了他赢得比赛的信心。所以选C。