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)_做题室

单项选择题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：
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