【题目】 in the adult ceremony，the senior students feel they are shouldering heavier responsibilities now.
A. Swear B. Sworn
C. Having sworn D. To have sworn
在线课程【答案】C
【解析】试题分析：考查非谓语动词。句意：经过成人仪式的宣誓，这些高中生觉得现在他们肩负着更重的责任。两个句子共用一个主语the senior students，并且“宣誓”这个动作发生在feel之前，故用having done形式。