题目内容：
回答题：Teaching and Learning
Many teachers believe that the responsibilities for learning lie with the student. If a long reading assignment is given, instructors expect student to be familiar with the information in the reading __51__ they do not discuss it in class or take an examination. The ideal student is considered to be one __52__ is motivated to learn for the sake of learning, not the one interested only in getting __53__ grades. Sometimes homework is returned with brief written comments but __54__ a grade. Even if a grade is not given, the __55__ is responsible for learning the material assigned. When research is assigned, the professor expects the student to take it __56__ and to complete it with minimum __57__. It is the student’s responsibility to find books, __58__, and articles in the library. Professors do not have the __59__ to explain how a university library __60__; they expect students particularly graduate students to exhaust the __61__ sources in the library. Professors will __62__ students who need it, but prefer that their students should not be too dependent __63__ them. In the United States professors have many other duties besides __64__, such as administrative or research work. __65__, the time that a professor can spend with a student outside of class is limited. If a student has problems with classroom work, the student should either approach a professor during office hours or make an appointment.
A．even if
B．because
C．as
D．for
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