The writer says that he had to pass the philosophy final (Paragraph 5) because ______. Ⅰ. if not, he would have had to attend the college’ s summer school Ⅱ. otherwise he would have been able to continue his study in the class Ⅲ. if he had failed the philosophy final, he would have been able to find time to work to earn money for next-term tuition A．Ⅰ onlyB．Ⅰ and ⅡC．Ⅰ and ⅢD．Ⅰ, Ⅱ and Ⅲ