问题

下列各组字母中全部是元音字母的是 ____。
A:a, e, o, r
B:a, i, u, e
C:o, u, e, n
D:b, e, c, t;
B:a, i, u, e
C:o, u, e, n
D:b, e, c, t;
正确答案是:
同类题型
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