单选题
编号：2578859
1.InwhichofthefollowingactivitiesdoestheteachermainlyplaytheroleofaController?
- A.Organizingthestudentstodoactivitiesbygivinginstruction.
- B.Changingthepaceoftheclassbyvariousmeans.
- C.Correctingmistakesandorganizingfeedback.
- D.Introducinganewgrammarpoint.