题海让大学四年没有难题
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题目详情

单选题 According to shape of the lips, English vowels can be classified into ______

A. open vowels and close vowels

B. front, central, and back vowels

C. rounded and unrounded vowels

D. monophthongs and diphthongs

学科:默认课程

时间:2025-06-18 09:04:42

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