所屬科目:教甄◆英文科
20.Examine the following data of a dialect of English, where there are variations between [əy] and [ay]. Which of the following statements is correct? (A) [əy] and [ay] are allophones of different phonemes. (B) [əy] becomes [ay] when occurring before a voiced sound. (C) [əy] and [ay] are in free variation. (D) [ay] becomes [əy] when occurring before a voiceless sound.