Is English Literature a(n) lesson, or does everyone have to learn it?
A. potential
B. typical
C. optional
D. critical
网友回答
A. potential
B. typical
(答案→)C. optional
D. critical
解析：考查形容词：A. potential有潜力的，B. typical典型的，C. optional可选择的D. critical至关重要的，句意：英国文学是选修课还是每个人必须学习的。选C。