When a student has made a sentence"I borrowed a paper from Miss Li" ,the teacher says," Do you mean'a piece of paper' ?" Here the teacher is playing the role of a( n)_____ .

做题室题库

When a student has made a sentence"I borrowed a paper from Miss Li" ,the teacher says," Do you mean'a piece of paper' ?" Here the teacher is playing the role of a( n)_ .