题目：
多选题
In listening teaching, whatˊs the teacherˊs role ?
- A. they must understand the pivotal role of listening.
- B. they must understand the different kinds of listening that learners must do in order to provide them with an appropriate range of listening experiences.
- C. they must understand the complex interactive nature of the listening process.
- D. they must understand how listening skills typically develop in second language learners.
答案：
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