What criterion is NOT used to classify the English vowels？A．The openness of the mouth.B．Th

What criterion is NOT used to classify the English vowels？

A．The openness of the mouth.

B．The shape of the lip.

C．The length of the vowels.

D．The position of the teeth.

请帮忙给出正确答案和分析，谢谢！

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