A ____vowel is one that is produced with the front part of the tongue maintaining the highest position.<br>A.back<br>B.central<br>C.front<br>D.middle

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

出自：信阳师范大学英语语言学

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