In American universities, classes are often arranged in more flexible _____ and many jobs on campus are reserved for students. ( 章节：6 难度：3)
- A、scales
- B、patterns
- C、grades
- D、ranks
正确答案:B
答案解析:有
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In American universities, classes are often arranged in more flexible _____ and many jobs on campus are reserved for students. ( 章节：6 难度：3)
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