Fifty-threethousandshoutingenthusiastsfilledthestadium；theyhadcometowatchthefirstgameoftheseasonandt

参考答案:

B

结构应用,本句的基本结构是：…enthusiasts had come to watch the first game of the season and to cheer the home team ；而fill the stadium是表伴随的状语，fill的逻辑主语是句子的主语，且 是fill这一动作的发出者，因此应用现在分词短语作状语并与主句用逗号分开，答案为B。