【单选题】The vowel [u:] in [fu:d] (food) is ______ vowel.
                    
A.back
B.front
C.unrounded
D.central
                
							【单选题】The vowel [u:] in [fu:d] (food) is ______ vowel.
                    
A.back
B.front
C.unrounded
D.central
                
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