单选题 This is their resolution that extra-curriculum activities _____ part of their school life.无

【正确答案】 D

【答案解析】句意：课外活动是他们学校生活的一部分，这是他们的决定。 This is their resolution that. . . should+， should可以省略。 “activities” 做主语，与make是被动关系，所以用be made。因此，本题的正确答案为D。