Every minute is made full use of our lessons before the exam.
A. studying
B. studied
C. to study
D. being studied
网友回答
A. studying
B. studied
(答案→)C. to study
D. being studied
解析：考查不定式做目的状语：句意：在考试前每分钟都要被充分利用来学习功课。Make full use of的宾语是every minute，不定式是目的状语，选C。