21. Franklin’s being good at learning from observations and experiences_______ greatly to his success in political life.
A. owed B. addicted C. contributed D. related
【解析】选C。考查动词固定搭配。句意为：富兰克林的擅于从观察和经历中学习极大地促成了他在政治生活中的成功。owe sth. to sb. 把……归于某人；be addicted to 沉迷于……；contribute to促成，有助于；relate to涉及，与……有关。根据句意答案选C。
