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题目内容
（国家开放大学 人文英语3）
Which is not true about the free online courses? 2
A. Students can watch short videos.
B. Students may ask the teachers some questions.
C. Students must take graded quizzes.
A. Students can watch short videos.
B. Students may ask the teachers some questions.
C. Students must take graded quizzes.
参考答案