we were all happy 51 gold medals in all in the 29th Olympic Games.
A. to have won
B. to won
C. winning
D. won
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(答案→)A. to have won
B. to won
C. winning
D. won
解析：本题考查非谓语动词。句中考查短语be happy to do高兴做某事，根据句意可知为过去发生的事情，故用不定式的完成式。句意：我们都很高兴在29届奥运会上总共获得51枚金牌。