When carrying out such exercises, students are actively involved in the learning process and they receive constant ( ) about their progress. ( 章节：4 难度：2)
- A、edition
- B、discount
- C、feedback
- D、freight
正确答案:C
答案解析:有
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When carrying out such exercises, students are actively involved in the learning process and they receive constant ( ) about their progress. ( 章节：4 难度：2)
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