A ______ vowel is one that is produced with the front part of the tongue maintaining the h

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A ______ vowel is one that is produced with the front part of the tongue maintaining the highest position.

A.back

B.central

C.front

D.middle

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。