问题
选择题
We usually use "an" before a word beginning _____ a vowel (元音音素). [ ]
A. of
B. with
C. at
D. as
答案
答案：B
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We usually use "an" before a word beginning _____ a vowel (元音音素). [ ]
A. of
B. with
C. at
D. as
答案：B