The sounds produced with the help of the upper teeth are called sounds ()
A . labio-dental
B . dental
C . post-alveolar
D . bilabial
出自:伊犁师范-英语语音

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块