组卷网 > 初中英语综合库 > 语法 > 冠词 > 不定冠词 > a/an的区别
题型:单项选择 难度:0.15 引用次数:3435 题号:6666000
It's ________ black.It's ________ black ruler.
A.a;/B./;a
C.a;aD.an; an

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