i bought__English-Chinese dictionary.It is reallyuseful one?填空

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i bought__________English-Chinese dictionary.It is really________useful one?填空
i bought__________English-Chinese dictionary.It is really________useful one?
填空

i bought__________English-Chinese dictionary.It is really________useful one?填空
an,a
前面an是在后面的单词第一个字母是元音的时候,a则相反.

an a

i i I I, I I I i i i i -I I i i i “I i