/p/, /b/, /m/ and /w/ are produced with the help of () .<br>A . the upper and lower lip<br>B . the tip of the tongue raised close to the hard palate<br>C . the upper teeth and inner lower lip<br>D . the tonque tip on or close to the alveolar ridge

/p/, /b/, /m/ and /w/ are produced with the help of () .
A . the upper and lower lip
B . the tip of the tongue raised close to the hard palate
C . the upper teeth and inner lower lip
D . the tonque tip on or close to the alveolar ridge

出自：伊犁师范-英语语音

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